Greenlee Knockout Set 7237 BB , BRAND NEW, ORIGINAL7237BB Greenlee Knockout Set Slug Buster Punch Kit 1. 5", 2" Part #: 297X719 Model #: 7237BB The 7237BB Greenlee Communications Slug Buster Knockout Punch Kit features 1 1 2" & 2" conduit sizes with 1. 951" & 2 3 8" hole sizes. Knockout Kit has a capacity of 10 gauge (3. 5 mm) mild steel but also cuts aluminum, fiberglass and plastic. The Greenlee Punch Set includes 1 1 2" conduit punch and die, 2" conduit punch and die, 3 4" conduit draw stud in a