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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
KLEIN 53732SEN Knockout Punch Set w/ Wrench 1/2" - 2" - Jireh Tools
11-Ton Hydraulic Knockout Kit with Hand Pump and Slug-Buster® 1/2" - 2" | Greenlee