TEMCo TH0037 4" Hydraulic Knockout Punch Electrical Conduit Hole Cutter Set KO Tool Kit 5 Year Warranty : Amazon.ca: Tools & Home Improvement
Greenlee Manual Knockout Punch Set 7238SB from Greenlee - Acme Tools
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
Central Manual Knockout Punch Kit for sale online | eBay
Amazon.com: AMZCNC Hydraulic Knockout Punch Electrical Conduit Hole Cutter Set KO Tool Kit 1/2 to 4 inch (15T(1/2"-4")) : Tools & Home Improvement