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Size:L25mm x D20mm/0.98inch x 0.79inch( L*D) Bore Diameter: 8mm to 8mm / 0.31inch to 0.31inch Material: Aluminum alloy Type: Plum shaped Super torque can absorb vibration, appropriate a large torque transmission.High hardness,Durable,and excellent response,not easy to loosen Flexibility of coupling shaft removes stress between the motor and driving components The shaft couplers are mainly used for CNC machines,servo motors, spindle, step motor etc