Non-rotating hole cutter. Heat treated for a long keen cutting life providing burr-free accuracy time after time. A small pilot hole is drilled allowing a connecting bolt to join the punch on one side and the die on the other side of the material. Pressure is then applied by tightening the bolt and thus the hole is literally punched out. Capacity: mild steel up to 16swg (1.62mm), stainless steel up to 16swg (1.62mm), sheet copper, brass and aluminum up to 2.0mm. Plus many other sheet materials and ductile plastic. Available in sizes 19mm, 25.4mm. Rectangular punches can also be supplied to special order. Please Note: Requires hexagon key to operate - supplied separately.