1pcs BR 6.35mmx9.5mm D25L30 CNC Motor Shaft Coupler 6.35mm to 9.5mm Coupling connect servo motor stepper motor encoder BR series flexible coupling CNC Motor shaft coupler Body Material: Aluminum Alloy Max torque: 1N.m Rated Torque(N.m) :0.5N.m Eccentricity error: 0.2mm Shaft angel  2 Max Rotational (rpm) :19000 Rated: In-phase operate D=25 L=30 d1=6.35 d2=9.5