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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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Milwaukee M18 18V Lithium-Ion Cordless FORCE LOGIC 6 Ton Knockout Tool 1/2 in. to 2 in. Kit w/(1) 2.0 Ah Battery, Die Set 2677-21 - The Home Depot
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Amazon.com: Lichamp Manual Knockout Punch Kit, Heavy Duty Metal Sheet Knock Out Box Hole Cutter Conduit Punch Driver Die Set : Tools & Home Improvement
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