3Axis Nema 23 Stepper Motor 270oz-in &Driver 4.2A CNC Router kit+power supply. 3 pcs Stepper motor driver DM542A, PEAK 4.2A, 128 micsteps. 1 pc Power supply 350W-24vdc/14.5A. Step Angle: 1.8 degree. Number of wire leads: 4. The diameter for motor shaft is 8mm. Feedback is very important to us. It is impossible to address issues if we do not know about them! Please keep the original box or packaging within 15days since item received. Your satisfaction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it's non-workdays, please kindly be patient and wait till Monday.