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2pcs M4 Rigid Flange Coupling Motor Shaft Coupler Connector ID 12mm OD 18mm for Electric Motors Assembly [Corrosion Resistant] Electroplated iron construction provides good corrosion , ideal for reliable use in different enviVGOL 
VGOL 2PCS 5mm to 8mm Shaft Couplers Aluminum Alloy Casing Rigid Coupling Compatible with Ender 3 V2 Ender 3 PRO Ender 3 Package includes 2pcs 5mm to 8mm shaft couplers.BQLZR 
BQLZR Blue 6mm to 6mm Aluminum Shaft Coupling Rigid Coupling Coupler Motor Connector with Spanner Pack of 2 Scope of application: widely used in blowers, 3D printers, DIY robots, CNC machine tools, stepper motors, etc.uxcell 
uxcell 10mm to 10mm Bore Rigid Coupling Set Screw L22XD16 Stainless Steel,Shaft Coupler Connector,Motor Accessories,2pcs Connection Diameter: 10mm to 10mm, Total Length: 22mm /0.87 inch, Outside Diameter : 16mm/ 0.63 inchBest Value tooloflife 
ToolOfLife 4/5/6.35/8/10/12/14mm Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector ✔Flange coupling is made of 45# steel, heat and electroplated process make it sturdiness and insulation.CHANCS 
CHANCS Rigid Coupling Set Screw 8mm to 6.35mm Bore Motor Shaft Connector for Motor Accessories 2PCS Motor Shaft Rigid Sleeve Coupling offer high torque, stiffness, low inertia and excellent sensitivity. Rigid Coupler welsourcing map 
sourcing map 6mm to 10mm Bore Rigid Coupling Set Screw L22XD16 45# Steel,Shaft Coupler Connector,Motor Accessories Connection Diameter: 6mm to 10mm, Total Length: 22mm /0.87 inch, Outside Diameter : 16mm/ 0.63 inchuxcell uxcell 5mm to 8mm Bore Rigid Coupling Set Screw L25XD14 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Blue,2p Connection Diameter: 5mm to 8mm, Total Length: 25mm /0.98 inch, Outside Diameter : 14mm/ 0.55 inchCHANCS CHANCS Motor Shaft Rigid Sleeve Coupling 7mm to 8mm Bore Rigid Coupling Set Screw Motor Accessories for DIY Parts 2PCS Motor Shaft Rigid Brass Sleeve Coupling offer high torque, stiffness, low inertia and excellent sensitivity. Hexagonal Cuxcell uxcell 2pcs 8mm Flange Coupling Connector, Shaft Axis Fittings for DIY RC Model Motors, with 4pcs Fastening Screw 1pcs M Flange Coupling Connector is widely used in model shaft connection and is a great accessory for RC model motors.CHANCS CHANCS Shaft Coupler Connector 8mm to 4mm Bore Rigid Coupling Set Screw for DIY Parts 2PCS Motor Shaft Rigid Sleeve Coupling offer high torque, stiffness, low inertia and excellent sensitivity. Rigid Coupler welBE-TOOL 5PCS Couplings Shaft, BE-TOOL Various Sizes Rigid Coupling Aluminum Shaft Coupling with Spanner and M4 Screw for DIY Mod Three Types Coupler，26 different sizes for your choosinguxcell uxcell 4mm to 6mm Bore Rigid Coupling Set Screw L25XD14 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Blue,2p Connection Diameter: 4mm to 6mm, Total Length: 25mm /0.98 inch, Outside Diameter : 14mm/ 0.55 inchBriny River Briny River 2x Silver Rigid Flange Shaft Coupling for 6mm Shaft Motor Optical Fixed with M3 thread Material: Made of aluminum alloy, with surface oxidation treatment, durable and beautiful appearance.CHANCS CHANCS Rigid Sleeve Coupling 10mm Bore 100MM Long Steel Shaft Diameter 10mm Bore Set Screw Motor Accessories for DIY Par 【Description:】 Motor Shaft Rigid Sleeve Coupling offer high torque, stiffness, low inertia and excellent sensitivity, youxcell uxcell 3mm to 3mm Bore Rigid Coupling 20mm Length 9mm Dia M3 Brass Shaft Coupler Connector for 3D Printers DIY Car Boat Couplings are widely used in blowers, 3D printers, DIY robots, CNC machine tools, stepper motors, etc. Similar to rigidSENRISE SENRISE Flange Coupling, 5 Set Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector for DIY Parts, 8mm Material: 45# steeluxcell uxcell Rigid Screw Coupling 6mm to 8mm Shaft Coupler Connector L25mm x D14mm Steel Joint Connector Rigid Coupling Set fo This durable connector, made from high-strength, heat-resistant steel, keeps a reliable connection between different shauxcell uxcell 8mm to 8mm Bore Rigid Coupling Set Screw L25XD14 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Blue,2p Connection Diameter: 8mm to 8mm, Total Length: 25mm /0.98 inch, Outside Diameter : 14mm/ 0.55 inchSorandy 5 Pack 2mm Flange Coupling Connector, Rigid Guide Steel Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Mo Material】2mm flange coupling connector is made of 45 steel, which is strong, wear resistant and has a long service life.uxcell uxcell 10mm Inner Dia H13*D16 Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector Silver Tone 2 PCS for DIY Inner Diameter: 10mm/0.39 inch, Total Height: 13mm/0.51 inch, Cylinder Outer Diameter: 16mm/0.63 inch, Cylinder Height:uxcell uxcell 6mm to 8mm Bore Rigid Coupling Set Screw L25XD20 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,4pcs Connection Bore Diameter: 6mm to 8mm; Total Length: 25mm/0.98 inch, Outside Diameter: 20mm/0.78 inch; with M4 ScrewsANCIRS 2 Pack Flange Coupling Connector, Rigid Guide Steel Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Motors 【Reliable Material】 Ancirs coupling connector is made of fine plating steel, heat and electroplated process make it sturLIYJTK 5PCS 4mm Flange Coupling Connector Steel Rigid Guide Model Coupler Accessory Shaft Axes Fittings for DIY RC Model Motors 45 STEEL: Flange coupling is made of 45 steel, heating and plating process makes it strong and insulated, impact shaft iuxcell uxcell 10mm to 10mm Bore Rigid Coupling Set Screw L22XD16 Copper,Shaft Coupler Connector,Motor Accessories,2pcs Connection Diameter: 10mm to 10mm, Total Length: 22mm /0.87 inch, Outside Diameter : 16mm/ 0.63 inchTopHomer 4mm to 5mm Bore Rigid Coupling Set Screw, Shaft Coupler Connector for Airplane Boat Motor Accessories Electric Car Toy PREMIUM COPPER MATERIAL---The shaft coupling is made of high-quality copper material, which has high compressive strengtCHANCS CHACNS Power Tool Parts Outer Diameter 10mm Inner Diameter 5mm Flange Coupling Connector 2PCS High Hardness Metal Rigid *Flange coupling is a special coupling that can fix a shaft to a flat surface and easily install other accessories on thuxcell uxcell 8mm to 8mm Bore Rigid Coupling 25mm Length 20mm Diameter Aluminum Alloy Shaft Coupler Connector Silver 4pcs Connection Bore Diameter: 8mm to 8mm; Total Length: 25mm /0.98 inch, Outside Diameter : 20mm/ 0.79 inch; with M4 ScrewsCENPEK CENPEK 4Pcs 8mm Flange Coupling Connector Rigid Guide Model Coupler Accessory Shaft Axis Fittings for DIY RC Model Motor Coupling connector is made of fine plating steel, heat and electroplated process make it sturdiness and insulation, striSG Store SG Store 4Pcs Flange Coupling Connector 5mm with Screws and M3 Hex Wrench for DIY Handmade Model RC Model Motors Hole Di Inner Diameter:5mm, Cylinder Outer Diameter:10mm, Cylinder Height:10mm, Base Height:2mm,Total Height:12mm, Mounting Holeuxcell uxcell 12mm to 12mm Bore Rigid Coupling Set Screw L25XD16 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Black Connection Bore Diameter: 12mm to 12mm; Total Length: 25mm /0.98 inch, Outside Diameter : 16mm/ 0.63 inch; with M4 ScrewFRCOLOR FRCOLOR Aluminum Alloy Rigid Flange Coupling Connector with 6mm Inner Diameter Shaft Base Set for Rc Motor DIY Parts and Motor shaft coupler--the compact design conserves installation space, making it ideal for use in areas with space availauxcell uxcell 10mm Inner Dia H13*D16 Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector Silver Tone for DIY Parts Inner Diameter: 10mm/0.39 inch, Total Height: 13mm/0.51 inch, Cylinder Outer Diameter: 16mm/0.63 inch, Cylinder Height:KDD INDUSTRIES Rigid Threaded Coupling 1/2 inch 20 pack 1/2 in. Rigid Conduit CouplingTreehobby 6Pack ZYCST Aluminium Alloy Shaft Coupling Rigid Stepper Motor Wheel Coupler Joint Connector for DIY Car Boat Airplane 3 Suitable for connecting two axis with different diameters, can also be connected with a motor axis, or connecting shaftsuxcell uxcell Shaft Coupling, 1" Bore 2" OD 3" Length Black Oxide Plated Steel Rigid Coupling for 3D Printers Motor Wheel(2 Set Size: 1 inch bore rigid set screw coupling, with 2 inch outside diameter, 3 inch length. (2 set screws)eMagTech eMagTech 4Pcs 8mm to 8mm Metal Shaft Coupling Universal Joint Shaft Coupling Flexible Coupling Connector Accessories for Package : You will get 4x 8mm to 8mm metal shaft coupling, 16x screw, 1x wrench.uxcell uxcell Rigid Screw Coupling 10mm to 10mm Shaft Coupler Connector L22mm x D16mm Steel Joint Connector Rigid Coupling Set This durable connector, made from high-strength, heat-resistant steel, keeps a reliable connection between different shauxcell uxcell 3.17mm to 5mm Bore Rigid Coupling Set Screw L20XD10 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Ligh Connection Bore Diameter: 3.17mm to 5mm; Total Length: 20mm /0.79 inch, Outside Diameter : 10mm/ 0.39 inch; with M3 Screuxcell uxcell 3.17mm to 4mm Bore Rigid Coupling Set Screw L20XD12 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Red Connection Diameter: 3.17mm to 4mm, Total Length: 20mm /0.78 inch, Outside Diameter : 12mm/ 0.47 inchuxcell uxcell Shaft Coupling, 1-1/8" Bore 2-1/8" OD 3" Length Black Oxide Plated Steel Rigid Coupling for 3D Printers Motor Whe Size: 1-1/8 inch bore rigid set screw coupling, with 2-1/8 inch outside diameter, 3 inch length. (4 set screws)uxcell uxcell 4mm to 6mm Bore Rigid Coupling Set Screw L26XD12 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories Connection Diameter: 4mm to 6mm, Total Length: 26mm /1.02 inch, Outside Diameter : 12mm/ 0.47 inchuxcell uxcell 8mm to 8mm Bore Rigid Coupling Set Screw L25XD14 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Black Connection Bore Diameter: 8mm to 8mm; Total Length: 25mm /0.98 inch, Outside Diameter : 14mm/ 0.55 inch; with M4 ScrewsABOOFAN ABOOFAN 10pcs Aluminum Alloy Rigid Couplings 8x8mm for Stepper Motor and Wheel with Stable Performance and Accurate Posi Efficient torque transmission: the rigid motor connector quickly transmits power from motor to shaft, reducing unwantedWiley Rigid-Flexible Coupling Hoisting Robots: Modeling, Analysis, and Control BE-TOOL Flange Coupling, BE-TOOL 5 Set Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector for DIY Parts (5mm) Material: 45# steelMAMJENNI 5 Pcs Shaft Coupling 22mm Length 14mm OD 5 to 8mm ID Bore Rigid Coupler Brass Motor Shaft Connector SIZE SPECIFICATIONS: The set contains 5 pcs shaft couplings, with the length of 22mm, the outer diameter of 14mm, the inuxcell uxcell 6mm Inner Dia H12*D10 Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector 2 PCS for DIY Parts Inner Diameter: 6mm/0.24 inch, Total Height: 12mm/0.47 inch, Cylinder Outer Diameter: 10mm/0.39 inch, Cylinder Height: 1KDD INDUSTRIES Rigid Threaded Coupling 3/4 inch 20 pack 3/4 in. Rigid Conduit CouplingSluffs 5Pcs Bore Rigid Coupling Set 5mm to 8mm Shaft Coupler Connector Stainless Steel Coupler Rigid Couplings for 3D Printers Steel Material: Made of premium steel material, this bore coupling is strong and sturdy, corrosion resistant and possessuxcell uxcell 10mm Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector for DIY Parts Country of Manufacture: CHINA; Material: MetalCGJsdrhET flange coupler, rigid coupling, 6pc Coupling Inner Diameter Motor Guide Shaft Coupler Connector(3.17mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.CGJsdrhET flange coupler, rigid coupling, Coupling Motor Guide Shaft Coupler Connector(12mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.YYALYYON 5Pcs Bore Coupling Steel Cylinder 8 to 8mm Fine Edges Bore Rigid Coupling Silver Steel Material: Made of premium steel material, this bore coupling is strong and sturdy, corrosion resistant and possessVogueing Tool Vogueing Tool Rigid Coupling Aluminum Shaft Coupling with Spanner and M4 Screw for DIY Model, 5Pcs Couplings Shaft High Quality: Made of aluminium alloy material, light, anti-oxidant, and anti-corrosive.Vogueing Tool Vogueing Tool Rigid Coupling Aluminum Shaft Coupling With Spanner and M4 Screw For DIY model, 5Pcs Couplings Shaft High Quality: Made of aluminium alloy material, light, anti-oxidant, and anti-corrosive.Vogueing Tool Vogueing Tool Rigid Coupling Aluminum Shaft Coupling With Spanner and M4 Screw For DIY model, 5Pcs Couplings Shaft High Quality: Made of aluminium alloy material, light, anti-oxidant, and anti-corrosive.CGJsdrhET flange coupler, rigid coupling, 5pcsSteel guide shaft support Coupling Motor Coupler Connector(3.17mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.CGJsdrhET flange coupler, rigid coupling 3pc Coupling Guide Shaft Bracket Coupler Motor Connector(12mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.CGJsdrhET flange coupler, rigid coupling 1PC Coupling Motor Guide Shaft Coupler Connector With Wrench(8mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.Healvian Healvian High-precision Aluminum Alloy Flange Shaft Coupling Connector with Reliable Connection and High Accuracy, Silve Guide shaft coupler motor connector--dependable connection method ensures stable transmission, preventing mechanical faiDpofirs Dpofirs Precision Rigid Coupling Strong Torsion 38N.M, CNC Machine Tools, Widely Used in Mining Machinery 1 X Rigid Coup [DURABLE & WEAR-RESISTANT] The anodized surface treatment enhances wear and corrosion , ensuring the longevity of this rSpringer Rigid-Flexible Coupling Dynamics and Control of Flexible Spacecraft with Time-Varying Parameters CGJsdrhET flange coupler, rigid coupling, 1Pc Coupling Motor Guide Shaft Coupler Connector Flange(6mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.CGJsdrhET flange coupler, rigid coupling, 2 PCS Coupling Motor Guide Shaft Coupler Connector Flange(4mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.LIYJTK 5Pcs Bore Coupling Steel Cylinder 8 to 8mm Fine Edges Bore Rigid Coupling Silver Steel Material: Made of premium steel material, this bore coupling is strong and sturdy, corrosion resistant and possessWangcmcol 5pcs Flange Coupling Connector Professional Stainless Steel 3mm Inner Diameter Rigid Flange Shaft Coupling Premium Material: Flange coupling connector is made of 45 gauge steel, strong and durable, corrosion resistant and longBlesiya Metal Flange Shaft Coupling Rigid Flange Coupling Motors Guide Shaft Bearing of 4 Pack Perfect accessories for RC Model motor, etc.Tewloss Tewloss 10 Pack Steel Compression Rigid Coupling, 3/4 Zinc Plated Steel Threadless Coupling with Spring Coil, Metal Elec Package: You will get 10 pack steel compression rigid coupling. Our steel connectors have a threadless design and are fiSENRISE SENRISE Couplings Shaft, Various Sizes Rigid Coupling Aluminum Shaft Coupling with Spanner and M4 Screw for DIY Model, 5 Three Types Coupler，26 different sizes for your choosingtooloflife 10 PCS 2mm to 2mm Brass Shaft Couplings, Rigid Motor Connector Joint with Grub Screws, Gold Colour Adapter for RC Boat C Robust Brass Construction: Made from corrosion-resistant brass material; this shaft coupling withstands moisture in rc bZyjGaliliad 5Pcs 14mm Flange Shaft Coupling, Rigid Flange Coupling Connector for RC Model Motors, Steel Precision - Machined Coupler Precision Engineering: This 14mm flange shaft coupling features accurate inner diameter and shape to match original motoJulihai Julihai 5Pcs 6mm Flange Shaft Coupling, Steel Rigid Coupling Connector for RC Model Motors, with Wrench and Screws for M [High Precision Engineering] The 6mm flange coupling connector features exquisite workmanship and a beautiful appearanceAlasum Alasum Aluminum Alloy Rigid Flange Coupling Connector Base for Rc Motor Shaft Coupler Compact Space-saving Design High-p Motor connector for DIY part--designed with a compact structure to save installation space, suitable for tight or,shaftPOCHY Bore Rigid Coupling Set Screw, Portable Car Model Shaft for 3D Printer, Eco-Friendly 3D Printer Joint Connector Rust-Pro Variety of Coupling: Our 3D Printer Shaft Coupling provides a range of specifications to fit different shaft diameters aLIYJTK Rigid Coupling Stainless Steel Shaft Coupler Connector D25L40 Motor Damping Coupling for Stepper Motors Servo Motors PA66 Material: The rubber body of this rigid coupling is made of PA66, which has good wear , erosion and electrical insuCGJsdrhET flange coupler, rigid coupling, Inner Dia H13D16 Coupling Motor Guide Shaft Coupler Connector 2PCS for DIY Parts(5mm) Type: Flange Shaft Coupling, suitable for model shaft connection, accessories for RC Model motor, etc.NOLITOY NOLITOY 5pcs Aluminium Alloy Flexible Shaft Coupler for Printer Stepper Motor Joint Elastic Connection Absorbs Vibration 3d printer stepper motor connector--it is manufactured with professional technology to ensure the of the product and canKHAONB 1pc 3D Printer T8 Lead screw rigid shaft coupler clamp stepper motor coupling D20L25 inner hole 5x8 for Ender 3/5 Sapphi CouplingsJMNVYO 1pc 3D Printer T8 Lead screw rigid shaft coupler clamp stepper motor coupling D20L25 inner hole 5x8 for Ender 3/5 Sapphi CouplingsSHINEOFI SHINEOFI Rigid Flange Coupling Connector with Connection and Stable Transmission Aluminum Alloy for Rc Motor Shaft Coupl Rigid flange coupling:the secure connection method of this coupling ensures stable and consistent transmission, significMOBUTOFU MOBUTOFU 4pcs Brass Copper Coupler Set Screw Rigid Coupling 7mm Inner Diameter Smooth Operation Fixed Motor Shaft Connec Coupler connector:coupling fixed, stable and not easy to fall off stable performance, smooth operation and no stagnationMEIJUN RAYWE 3pcs Rigid Shaft Coupling 5mm to 8mm Bore L23xD18 Shaft Coupler Connector for 3D Printer Stepper Motor CNC Machine ⚽Rigid shaft coupling, compatible with 3D printer, CNC machine, stepper motor, etc.IMUSINICE IMUSINICE Rigid Flange Coupling Shaft Coupler and Precision Machining Aluminum Alloy with Wear Resistance for Rc Model A Shaft fittings:precision machining process ensures high transmission accuracy, providing dependable and efficient operatMingzhe Mingzhe 3pcs Rigid Shaft Coupling 5mm to 8mm Bore L23xD18 Shaft Coupler Connector for 3D Printer Stepper Motor CNC Machi Made of aluminum alloy, durable and wear resistant.TOMETURE TOMETURE Rigid Flange Shaft Coupling Connector Made of Sturdy Aluminum Alloy with Wear Resistance and Versatile Applicat Motor connector:utilizing a high-precision manufacturing process, this shaft coupler allows accurate transmission, thereDam Skerisi 5Pcs 14mm Flange Shaft Coupling, Rigid Flange Coupling Connector for RC Model Motors, Steel Motor Shaft Coupler with Acc Precise Engineering: This 14mm flange shaft coupling features exact inner diameter and hole alignment to match originalGeneric 3pcs Rigid Shaft Coupling 5mm to 8mm Bore L23xD18 Shaft Coupler Connector for 3D Printer Stepper CNC Rigid shaft coupling, compatible with 3D printer, CNC , stepper , etc.HOOWIFFY HOOWIFFY Aluminum Alloy Rigid Flange Coupling Connector Precision Machining Wear Resistant High Strength Metal Couplings Universal sprocket hub adapter--crafted from firm aluminum alloy, this flange coupling is designed to withstand corrosioKichvoe Kichvoe Rigid Flange Coupling Connector with High Accuracy and Precision Machining Aluminum Alloy for Rc Model Motor Sha Aluminum flange coupling motors guide shaft:reliable connection method ensures stable and consistent transmission, reducOyhhalginate 5Pcs 14mm Flange Shaft Coupling, Rigid Flange Coupling Connector for RC Model Motors, Steel Motor Shaft Coupler with Acc Precise Engineering Fit: This 14mm flange shaft coupling features exact inner diameter and hole positioning to match oriGramigg Aluminium Rigid Motor Shaft Coupling Coupler Motor Transmission Connector 3D Printers Compatible for Engraving Machines Our coupling find wide application in small CNCmachines and 3D printers, specifically on the Zaxis. Its high torques rigCGJsdrhET 2Pcs Flange Rigid Shaft Coupling Coupler Collar Clamp Bracket Motor Guide Joint Connector(6.35mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.Generic 3pcs Rigid Shaft Coupling 5mm to 8mm Bore L23xD18 Shaft Coupler Connector for 3D Printer Stepper CNC Rigid shaft coupling, compatible with 3D printer, CNC , stepper , etc.MAGICLULU MAGICLULU Rigid Flange Shaft Coupling Aluminum Alloy Connector Base Set with High Accuracy and Reliable Connection for R Model coupler accessory:reliable connection method ensures stable transmission, reducing the risk of mechanical failurePOENVFPO POENVFPO Stainless Steel Flange Coupling, 12mm Aperture Rigid Motor Shaft Connector with Smooth Edges for Model Wheel Co [Stable Performance High Reliability] Professionally manufactured with exquisite workmanship, these couplings deliver coCGJsdrhET 2Pcs Flange Rigid Shaft Coupling Coupler Collar Clamp Bracket Motor Guide Joint Connector(12mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.LAPOOH LAPOOH 3pcs Rigid Shaft Coupling 5mm to 8mm Bore L23xD18 Shaft Coupler Connector for 3D Printer Stepper Motor CNC Machin High torque with rigidity, low intertia and excellent sensitivity.CGJsdrhET 2Pcs Flange Rigid Shaft Coupling Coupler Collar Clamp Bracket Motor Guide Joint Connector(4mm) Flange coupling rigid flange disc shaft couplings optical axis easy for installment and replacement.