Greenlee Slug-Buster 7238SB Manual Knockout Punch Die Kit, 10 ga Capacity, For Use With Battery Powered/Hydraulic Ratchet Driver and 3/8 in and 3/4 in Draw Stud, 1/2 to 2 in Conduit/Pipe, Mild Steel
GREENLEE, Hydraulic Punch Driver Set - 5C633|7306SB - Grainger
GREENLEE Hydraulic Knockout Punch Set (NIH571) | Linen Plus
Knockout kit with Slug-Splitter® SC punches, dies, draw studs for 1/2 -2" in steel case
For punching holes in mild steel, stainless steel, aluminum, brass, copper, fiberglass and plastics