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TEMCo TH0390 – Manual Knockout Punch Driver Kit (Set) for ½ inch to 2 inch Electrical Conduit Hole Sizes (1/2"-2" Conduit Size) - Amazon.com
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Greenlee 16 Piece, 2" Punch Hole Diam, Manual Knockout Set Round Punch, 10 Gage Mild Steel 7238SB - 60060142 - Penn Tool Co., Inc
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