Features Efficient Use The stepper motor has low power and allows stable speed, low noise and low loss for efficient 3D printer extruder. Reliable Work: With fast heat dissipation, 0.3Nm large torsion and high accuracy, the 42 step motor is very convenient. BETTER DESIGN Double D type output shafts promise safe driving, and the standard configuration shaft is 23mm and will not fail. Fine Workmanship: Made of copper and exquisite workmanship, the evenly arranged motor wire ensures reliable working performance. EASY TO INSTALL Designed to be light weight and compact size, the installation of this 2 phase 4 conductor motor is very convenient. Specification: Item Type: Stepper Motor for 3D Printer Model: 42BYGH34-1304B Body size: approx. 34 mm / 1.34 inches. Torsion: 0.3 Nm. Current: 1.3A Shaft diameter: approx. 5mm/0.2", Type D Front shaft length: approx. 20 mm. Rear shaft length: approx. 10mm/0.39", Female Type Note: the standard configuration shaft is 23mm/0.91" (approx. ), the cable length is 30 cm / 11.81 inches, 70 cm / 27.56 inches, 1 m / 3.28 feet (approx. ). Wire: 2 phase 4 line (black A+, green A, red B+, blue B) Package list: 1 x 3D Printer Stepper Motor Package List 1 x 3D Printer Stepper Motor