The TB6560 is a cost effective way to get your stepper motors moving (slightly more expensive than "stick" stepper drivers but a lot more capable). Perfect for driving Nema 17's and 2A Nema 23 steppers.

Specifications:

* Toshiba TB6560AHQ chip. 
* 1-1/16 microstep setting. 
* Adjustable 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 protection.