he G251X is our most popular product for small to medium sized stepper applications. With an easier to use 3.5mm terminal block for end-user wiring the G251X is a favorite of hobbyists and OEM’s alike. Its small size (only 1.65” x 1.3” x 0.585”) makes it a perfect candidate for small platform CNC machines, 3D printers or any small to medium power automation application.