27:1 Planetary Gearbox Nema 17 Stepper Motor 1.68A for DIY CNC Robot 3D Printer * High Torque Good Speed * 0.067 Step Angle Planetary Gearbox Ratio 26.85:1 * NEMA-17 bipolar 4-wire with motor length 40mm * Rated current 1.68A & resistance 1.65ohms * Rated Speed 7rpm/Rated Torque 3Nm