High Torque Nema 17 Bipolar Stepper Motor 92oz.in/65Ncm 2.1A Extruder Motor Very High Torque 65Ncm(92oz.in) holding torque NEMA 17 bipolar 1.65"x1.65"x2.36" 4-wire 1.8 deg. step angle(200 steps/rev) Rated current 2.1A & resistance 1.6ohms