Snap Lock Punch, Punch Type Sheet Metal Punch, Application Sheet Metal Fabrication, Creates Hole Size 3/8 in, Overall Length 8 in, Maximum Jaw Opening 3/8 in, Maximum Material Thickness Aluminum: 0.035 in, Copper: 0.023 in, Galvanized Steel: 0.028 in, Mild Steel: 0.024 in, Stainless Steel: 0.018 in, Features Easy One-Hand-Operation, Including an Easy Open and Close Latch Motion, Redline Handle With Compound Handle Leverage, Finish Black Oxide, Frame Material Steel, Handle Color Red/Black