Item Name: Nema 17 Stepper Motor with Magnetic Column Feature: 2 Phase, Step Angle 1.8, NEMA 17 (42 x 42 mm) With built-in (pre-installed) Magnetic Column to install closed loop encoder (not included) PCs in Item: Motor x 1 Manufacturer: ShenZhen ZDT, Made in China Referrence: Stepper Motor Technical Support – DIYCNC