One NEMA17 stepper motor, 2A, 1.8deg, single shaft model with holding torque 83oz.in/0.59N.m. The shaft is 5mm diameter and 17mm long. Connection is made through 4-wires (Black, Green, Blue, Red) 225mm long stripped and tinned. Alltronics Part# N1728S87. For more information see http://www.alltronics.com/mas_assets/acrobat/N1728S87.pdf