Features: Brand new and high quality The upgraded version of TB6600 is a driver suitable for 57/42 type two-phase stepping motor with phase current 4.0A. Set 7 kinds of subdivisions (1/2A/2B/4/8/16/32) through 6-bit DIP And 8 gear output current (0.5A/1.0A/1.5A/2.0A/2.5A/2.8A/3.0A/3.5A). Widely used in various small and medium-sized automation equipment and hardware,such as: engraving machine, marking machine, cutting machine, CNC machine tool, crystal grinding machine, automatic assembly equipment, etc. The best application object is 57 stepper motor and 42 stepper motor with a torque of 1.8Nm. Strong metal material ensures maximum strength and durability for long lasting usage. Specifications: Material:Plastic+Metal Type:6.35mm/8mm Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Stepper Motor