GREENLEE, 10 ga Max Sheet Metal Capacity-Steel, Falls Free, Round Knockout Punch Kit - 3UME6|735BB - Grainger
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Greenlee - 11 Piece, 1/2 to 1-1/4″ Punch Hole Diam, Manual Knockout Set - 04226320 - MSC Industrial Supply
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Greenlee 7238SB Slug-Buster Knockout Kit with Ratchet Wrench, Grey & Green, Full Size : Amazon.ca: Tools & Home Improvement
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