This is a homemade finger press brake. It will be powered by two 20 ton air operated bottle jacks. It has a bend length of 62 inches. I will be used to make ... For those of you who don't know, a press brake is a tool for bending metal by pressing two dies together. They can be powered many different ways, but by far the most popular method is some sort of hydraulic cylinder to apply literal tons of force. Lucky for me my shop has a hydraulic press.