Knockout hole punch set for making perfectly round and burr-free holes in stainless steel vessels with up to 1.5 mm material thickness.
Usage: Pre-drill the hole (preferably use step drill and cutting oil). Thread the screw through with washer and stop on the outside and cutting sleeve on the inside. Tighten with a ratchet.
Hole diameter: 41 mm
Pre-drilling: 16 mm