Use the Snap Lock Punch tool to make 3/8-Inch (1 cm) wide impressions on metal edges to join pieces of sheet metal, duct or pipe. The compound-leverage mechanism provides greater control and easy operation. This cutting and notching tool has comfortable, contoured grips covering hardened steel handles and features a convenient self-opening tool latch. The all-steel construction and nickel-chrome plated hardware provides long life and durability.