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Best Choice New YIXISI 10 PCS Flexible Couplings 5mm to 8mm NEMA 17, Stepper Motor Coupler Aluminum Alloy Joint Connector, Shaft Coupler Package includes: 10 PCS Flexible Couplings 5mm to 8mm NEMA 17 with 1 Allen Wrench.New sourcing map 2PCS Motor Shaft 4mm to 8mm Helical Beam Coupler Coupling 20mm Dia 25mm Length Zero backlash. Two-piece metallic spring coupling. For little torque shaft connect.New sourcing map 2PCS Motor Shaft 8mm to 8mm Helical Beam Coupler Coupling 25mm Dia 30mm Length Zero backlash. Two-piece metallic spring coupling. For little torque shaft connect.Best Value New sourcing map 2Pcs 3mm to 3mm Aluminum Alloy Shaft Coupling L25xD19 Flexible Coupler with Screws Beam for 3D Printer CNC Connection Bore Diameter: 3mm to 3mm,Total Length: 25mm/0.98 inch,Outside Diameter: 19mm/0.75 inch,Material: Aluminum AlNew Aopin Flexible Beam Couplings 6mm to 8mm Shaft for 3D Printer, Length 25mm / 1" Coupler Motor Connector Casing Joint, Gr 【Flexible Couplings Beam Shaft Size】: 6mm to 8mm / 0.24" to 0.31". Coupling With M4 Fastening Screws. Outer Diameter: 19New Sourcingmap Motor Shaft 6mm to 8mm Joint Helical Beam Coupler Coupling 20mm Dia 25mm Length Silver Country of Manufacture: CHINA; Material: Aluminum AlloyNew sourcing map 1Pcs 5mm to 12mm Aluminum Alloy Shaft Coupling L31xD25 Flexible Coupler Beam for 3D Printer CNC Machine DIY Connection Bore Diameter: 5mm to 12mm,Total Length: 31mm/1.22 inch,Outside Diameter: 25mm/0.98 inch,Material: Aluminum ANew Aopin Flexible Beam Couplings 8mm to 8mm Shaft for 3D Printer, Length 25mm / 1" Coupler Motor Connector Casing Joint, Gr 【Flexible Couplings Beam Shaft Size】: 8mm to 8mm / 0.31" to 0.31". Coupling With M4 Fastening Screws. Outer Diameter: 19New sourcing map 8mm to 12mm Shaft Coupling 30mm Length 25mm Diameter Stepper Motor Coupler Aluminum Alloy Joint Connector f Shaft Usage: 8mm to 12mm / 0.31 to 0.47 inchNew sourcing map Motor Shaft 10mm to 11mm Helical Beam Coupler Coupling 25mm Dia 30mm Length Zero backlash. Two-piece metallic spring coupling. For little torque shaft connect.