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Best Choice New 4Pcs Flange Coupling Connector, Rigid Guide Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Motors (8mm) Durable Material: The coupling connector is made of 45# steel( it is better than copper and aluminum alloys ), heat andNew sourcing map 8mm Inner Dia H13 x D16 Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector for DIY Parts Inner Diameter: 8mm/0.31 inch; Total Height: 13mm/0.51 inch; Cylinder Outer Diameter: 16mm/0.63 inch; Base Diameter: 32mNew sourcing map 4mm to 4mm Bore Rigid Coupling Set Screw L20XD12 Aluminum Alloy,Shaft Coupler Connector for RC Airplane Boa Connection Diameter: 4mm to 4mm, Total Length: 20mm /0.78 inch, Outside Diameter : 12mm/ 0.47 inchNew sourcing map 6mm to 10mm Bore Rigid Coupling Set Screw L22XD16 45# Steel,Shaft Coupler Connector for 3D Printers, Motor Connection Diameter: 6mm to 10mm, Total Length: 22mm /0.87 inch, Outside Diameter : 16mm/ 0.63 inchBest Value New sourcing map 10mm to 10mm Bore Rigid Coupling Set Screw L22XD16 45# Steel,Shaft Coupler Connector for 3D Printers, Motor Connection Diameter: 10mm to 10mm, Total Length: 22mm /0.87 inch, Outside Diameter : 16mm/ 0.63 inchNew Jopto 5Pcs Shaft Couplings 5mm to 8mm Shaft Rigid Coupling Stepper Motor Wheel Coupler Connector Aluminum Alloy Casing C Made of premium aluminum material, it is durable and long lasting use.New sourcing map 8mm to 8mm Bore Rigid Coupling Set Screw L25XD18 Aluminum Alloy,Shaft Coupler Connector for 3D Printers, Mo Connection Bore Diameter: 8mm to 8mm; Total Length: 25mm/0.98 inch, Outside Diameter:18mm/0.7 inch; with M4 ScrewsNew sourcing map 6mm to 6mm Bore Rigid Coupling Set Screw L22XD14 Stainless Steel,Shaft Coupler Connector for 3D Printers, M Connection Diameter: 6mm to 6mm, Total Length: 22mm /0.87 inch, Outside Diameter : 14mm/ 0.55 inchNew Ohamtes 4Pcs shaft diameter 4mm to 6mm rigid coupling, suitable for 3D printers, DIY encoders, motor connectors, motor g Material: high-quality aluminum alloy material, surface colorful oxidation processing, corrosion resistance; surface colNew TA-VIGOR 6mm Rigid Flange Coupling H15xD15mm Motor Guide Shaft Coupler Motor Connector, Aluminum Alloy Shaft Axis Fittin 【Size】Inner Diameter: 6mm/0.24 inch, Total Height: 15mm/0.59 inch, Cylinder Outer Diameter: 15mm/0.59 inch, Base Height: