Knock Out Punch, Standard Round Punch, Hole Size Nominal 3.5 in, Hole Size (In.) 4 1/25 in, Conduit and Pipe Size (In.) 3 1/2 in, Max. Capacity Mild Steel (Ga.) 10 ga, Slug Round Slugs, Knurled Edge, Laser Marking, For punching holes in mild steel,...