If using the KOM350 or KOM400, the drive screw that is included with the kit (KS3540) is large enough so that the KC3540 is not needed. But for other applications a KC3540 converter needs to be used when using a cylinder/driver to punch a hole on any 3 ½” or 4” punches with the KPR7540 draw stud.
What do I need for punching larger holes?
Reply
Gardner Bender FAQ 