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TH0392-3/4" Conduit hole size Knockout punch unit with manual draw stud – (1.11" – Actual Hole Size)
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IBOSAD Manual Knockout Hole Punch Driver Kit 1/2 to 2 inch Electrical Conduit Hole Cutter Set KO Tool Kit,Can't Use for Stainless Steel Plate : Amazon.co.uk: DIY & Tools
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