... ROHS hybrid stepper motor, NEMA 16, Frame size 39mm, CE and ROHSModel No.RatedVoltageCurrent/PhaseHoldingTorque# of LeadsRotorInertiaDetentTorqueLengthSingle shaftDouble shaftVAg-cm ... to 5,700 Ounce-InchesStep Angle:1.8 and 0.9,3.6 Degree,Square-Bodied, High-Torque Stepper Motors. Round version ... , 110mm, 130mm Nema 16 hybrid stepping motor, Frame size 39mm, CE and ROHS