HICTOP Nema17 42 stepper motor 1.5A 57oz.in 40mm 4-lead for Makerbot Reprap I3 Universal 3D Printer Hobby CNC 3D printer motor with high torque NEMA 17 bipolar 1.65"x1.65"x1.57" 4-wire 1.8 deg. step angle(200 steps/rev) 40Ncm (56.7oz.in) holding torque Extremely Tight Tolerance Improves Accuracy and Consistency of Prints