This DM860H is with Aluminum cover. Suitable for Nema 23 and Nema34 Stepper Motor (2-phase hybrid stepper motors (Outer diameter: 57,86mm). High‑speed response microstepper motor, the speed is doubled compared with analog chip. The DM860 is the latest chip for DSP driver that features of high performance, high turning moment, low noise, and strong anti-interference ability Overcurrent, overvoltage, undervoltage, short circuit protection to insure safety operation. With great workmanship, this motor driver can perfect replace the old one. Apply in dispensing machine, woodworking machine, welding machine, screw machine, winding machine, placement machine, packaging machine, engraving machine , LED, electronic equipment, etc. Color: black Material: plastic+metal Package Contents: 2X High‑speed response microstepper motor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.