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Greenlee 7235BB Knockout Kit Hole Punch Set, 10 Piece, 10, 12 ga. Steel, 1/2" - 1-1/4" conduit size knockouts (hole size: 0.89" - 1.70" or 22.5 mm - 43.2 mm) - Hand Tool Knockout Punches - Amazon.com
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Amazon.com: 1/32 DIN 45x22mm Hydraulic Knockout Punch & Die Set (Greenlee Thread) : Tools & Home Improvement
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