SUNWIN 4 Axis CNC Stepper Motor Driver TB6560AHQ Board Controller Router Mach3 KCAM4 Toshiba TB6560AHQ chip - High power, maximum 3.5A drive current chipset ! 1-1/16 microstep setting - Higher accuracy and smoother operation than standard 1, 1/2 step! Adjustable 1.5A-3A drive current settings for each axis - 25%,50%,75%,100% of full current can be set for different stepper motors Overload, over-current and over-temperature safety - Full protection for your computer and peripheral equipment On board current switching - Power output can be set according to specific user requirement !