Multcyl air over hydraulic cylinder, cage (or frame), operated by a pneumatic foot pedal. I used it for installing PEM inserts in aluminum flanges making it a very fast operation. Currently it has a C frame punch holder that can take a wide variety of punches. The current punch makes electrical "holes" with the slug retained by a tab as per common electrical boxes, but a wide variety of punches can be fitted. Manual and documentation. New cost without the C frame punch was $1950. Sell for $400. Might consider a trade, but I would be picky since I am trying to reduce my tool list as I rapidly approach 80.