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Size: 25 x 20 mm (L x W); Diameter: 5 mm to 8 mm Material: aluminum alloy, polyurethane type: plum shape Super torque can absorb vibration, good torque transmission. High hardness, durable and excellent response, not easy to loosen Coupling shaft flexibility eliminates tension between motor and driving components Shaft couplers are mainly used for CNC machines, servo motors, shafts, stepper motors, etc