Knockout Punch Standard Hole Size Nominal 4.044 In. Hole Size (In.) 4 Conduit and Pipe Size (In.) 3-1/2 Max Capacity Mild Steel (Ga.) 10 Slug Splitting Up to 3 Times Faster Setup and Disassembly Cutter Use With Mfr No 7212SP-3-1/2D 7212SP11 LS50L or Hydraulic Ram