The American Punch Tonnage Calculator App features four calculators for determining the information necessary for accurately and safely punching holes in a variety of materials typically found in the structural steel and fabrication industries. Designed with the ironworker, machine operator, estimator or engineer in mind, these calculators offer a way to determine the required tonnage for punching mild steel and the proper die clearance. It also has a calculator for determining the correct diagonal measurement for square, rectangular and hex shapes. Even includes a measurement conversion calculator. All in one, easy-to-use app!