Features Effective use: 3D Printer 42 -step motor has a small power. Step motor can achieve stable speed, low noise and almost no loss. For effective 3D printer extruders. High -efficiency wWork: 3D Printing and extrusion function quickly dissipates heat, 0.3N · m large torsional and high precision, 42 -step horse motor is very practical. Fine production: 42 -step Motor is made of copper. Through exquisite craftsmanship, uniformly arranged electric wires can ensure reliable working performance. Dual Output Shaft: The extruder is a D -type dual output shaft, which is largely reliable. The default configuration shaft is 23mm, which will not easily fail. Easy to Install: The design of the dual -out 3D printing motor is light and compact size. The installation of the 3D printed 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 Package List 1 x 3D Printer Stepper Motor