A PowRlock head is small enough to hold in your hand, yet powerful enough to punch a 1/2" hole in 5/16" thick mild steel plate. Its inherent characteristics permit you to build a specialized clamping system on your machine - any machine, using existing fixtures. PowRlock is much more than a simple hydraulic cylinder. It's a concept of high holding forces engineered to be applied easily to all kinds of manufacturing processes and to give high performance and dependability. Clamping and punching pressures are available to 27,500 pounds force.