"Stepper motor spec: 2 Phase bipolar 4 wires Rated Voltage 2V DC Rated Current 1.2A Phase Resistance: 1.7 Ohm ± 10% (20º C) Phase inductance: 4.5 mH ± 20% (1kHz 1 V rms) Holding torque: 0.4 N.m Min. Shaft diameter: 5mm / 0.188"" (3/16"") Shaft length: 22mm Motor depth: 40mm Controller spec: Wide supply voltage 12-48VDC Current per phase 3A or 6A, instruction adjustable Full step to 256th micro-stepping resolution Dual full H-bridge with PWM constant current control"