GREENLEE, 10 ga Max Sheet Metal Capacity-Steel, Falls Free, Round Knockout Punch Kit - 3UME6|735BB - Grainger
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Amazon.com: UTZIKO Hydraulic Knockout Punch Electrical Conduit Hole Cutter Set KO Tool Kit 1/2 to 4 inch : Tools & Home Improvement
GREENLEE, 6 Pieces, 10 ga Max Sheet Metal Capacity-Steel, Knockout Punch Driver Set - 5C632|7238SB - Grainger
Greenlee® Slug-Buster SC® 28156 Self-Centering Knockout Punch, 1.115 in Dia, 3/4 in | Steiner Electric Company
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