Specifications Five-pole armature for superior torque and smoothness Fan-cooled Heavy-duty 5mm output shaft Features an extra wrap of steel around the can for maximum magnetic field strength Can Diameter: 46.35mm (1.8") Can Length: 67mm (2.6") Shaft Diameter: 5mm (0.20") Shaft Length: 13.5mm (0.53") Input: 16.8V Turns: 10 turns