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Greenlee 28157 KNOCKOUT PUNCH UNIT DIE, 3/4 in - Hand Tool Knockout Punches - Amazon.com
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Greenlee 735BB Round Knockout Punch Kit, 1/2 to 1-1/4 In - Hand Tool Knockout Punches - Amazon.com
Amazon.com: 1/16 DIN 45x45mm Knockout Punch & Die Set (Fits Greenlee Driver) : Tools & Home Improvement
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Greenlee 7308 Knockout Kit Punches and Dies for 2-1/2 Inch, 3 Inch, 3-1/2-Inch, and 4-Inch Conduit, Draw Stud, Sleeve and Case - Hand Tool Knockout Punches - Amazon.com
Greenlee 7211BB-1/2 Slug-Buster Knockout Punch Unit, 7/8-Inch - Hand Tool Knockout Punches - Amazon.com
Amazon.com: Greenlee 730BB-1-1/2 1-1/2" Hole Size Standard Round Knockout Punch Unit : Tools & Home Improvement