Mini Stepper Motor Nema11 Bipolar 3.8V 0.67A 8.5oz-in/6Ncm DIY Robot CNC (No Single keyed shaft) Small Size, High Efficient Bipolar Stepper, holding torque 6 Ncm(8.5 oz.in) NEMA 11 bipolar 1.1"x1.1"x1.24" 4-wire(Black, Green, Blue, Red) 1.8 deg. step angle(200 steps/rev),Drive 0.67A Shaft Diameter 5mm, Shaft Length 20mm