Features： 1、Fine Crafting: Made of copper and through exquisite workmanship, the evenly arranged motor wire ensures reliable working performance. 2、Efficient Use: Small in power, the stepper motor enables stable speed, low noise and little loss for a efficient 3D printer extruder. 3、Reliable Work: Comes with quick heat dissipation, 0.3N·m large torsion as well as high accuracy, the 42 step motor is very practical. 4、Better Design: Dual output shafts in D type promise safe driving, and the default configuration shaft is 23mm, will not malfunction. 5、Easy to Install: Designed to have a light weight and a compact size, the installation of this 2 phase 4 lead motor is very convenient. Specification： Item Type: 3D Printer Stepper Motor Model: 42BYGH34-1304B Body Height: Approx. 34mm / 1.34in Torsion: 0.3N·m Current: 1.3A Shaft Diameter: Approx. 5mm / 0.2in, D Type Front Shaft Length: Approx. 20mm / 0.79in Rear Shaft Length: Approx. 10mm / 0.39in, socket type. Note: The default configuration shaft is 23mm / 0.91in(approx.), the wiring length is 30cm / 11.81in, 70cm / 27.56in, 1m / 3.28ft(approx.). Lead: 2 phase 4 lead (black A+, green A-, red B+, blue B-). Package List： 1 x 3D Printer Stepper Motor