TEMCo TH0037 4" Hydraulic Knockout Punch Electrical Conduit Hole Cutter Set KO Tool Kit 5 Year Warranty : Amazon.ca: Tools & Home Improvement
New Milwaukee Force Logic 6T Knockout Punch Tool, Cutter, Crimper, ProPEX
49-16-2671 - Milwaukee Electric Tool - Knockout Punches
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