A knockout hole punch from Grainger can help you easily punch holes in mild steel and aluminum. Round knockout hole punches can work great for installing electrical pipe and conduit. Help punch D-shaped, double D-shaped and square holes for switches and instruments. Use an oil-tight punch to help accurately align and produce burr-free holes for oil-tight switches. Choose punches for the type of holemaker you have and the size and shape of the holes you want to make. Shop Grainger today for the knockout hole punch that can help make your job easier!