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Zzanggu 2PCS Flexibility Coupling, Shaft Couplings 5mm to 6.35mm for 3D Printer or CNC Machine 【Shaft Usage Range】 Suitable for 5mm to 6.35mm/ 0.19 to 0.25 inch 【Materials】 Aluminum alloy 【Size】 25mm x 19mm(L x D) 【Main Color】 Silver 【Weight】 16g / 0.63 oz 【Features】 [1] Zero backlash. One-piece metallic spring coupling. For little torque shaft connect [2] Flex capability of the coupler removes stress when shafts are not aligned perfectly [3] Useful in RepRap 3D Printers and small CNC machines [4] Compatible with NEMA 17 stepper motors (for 5mm to 6.35mm shaft diameter). 【Packaging Includes】 Flexibility Coupling(5mm to 6.35mm) x2