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Gardner Bender Slug-Out Knockout Set for 2-1/2 inch (6.35 cm) Conduit, Includes Punch, Die, and Drive Screw in the Knockout Punch Sets department at Lowes.com
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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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Gardner Bender KOM50125 Slug-Out Mechanical Knockout Set, Contractor Punch, Die, Bearing & Drive Screw Set, ½- 1¼ Inch Conduit Pipe Size Cutting Diameter, 10 AWG Mild Steel & 12 AWG Stainless Steel -
GREENLEE, 10 ga Sheet Metal Capacity (Steel), 2 27/64 in Nominal Size, Knockout Punch Set - 55FE75|K2BB-2 - Grainger
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