Stepper Motor Lead Screw Coupling CNC Flexible Shaft Coupler Features of shaft coupling 1) High concentricity, big torque 2) Aluminum material 3) Reducing the transmission of shock 4) Simple construction, easy to mount and maintenance 5) Suitable for stepper, servo, ballscrew Series commonly used on CNC engraving machine Series D40L55, Series D55L78, Series D65L90