60077 Greenlee Tools, Hole Punch, D-Type with Die & Draw Stud, 12.7mm
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
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Knockout Sets | Greenlee
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Greenlee 50600770 12.7mm x 11.9mm "D" Shaped Punch