Gardner Bender Knockout Converter KC3540 The Gardner Bender KC3540 Knockout Converter is used with the KOH14A Slug-Out Hydraulic Knockout Set and can also be sold separately. Just thread the KC3540 converter into the punch from the inside until seated making sure the die counter bore is positioned over the boss projecting from the port end of the cylinder. The converter requires a 1-15/16-Inch diameter or larger guide hole.
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