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 735 Conduit Knockout Punch Set 1" 1-1/4” 1-1/2” In Leather Pouch | eBay
Greenlee Slug-Buster 735BB Manual Standard Round Knockout Punch Die Kit, 10 ga Capacity, For Use With Greenlee KRW-1 High Leverage Ratchet Wrench, 1/2 to 1-1/4 in Conduit/Pipe, Mild Steel
GreenLee 1/2" conduit punch for making 7/8" (22mm) diameter holes - The Electric Brewery