Patent ID: 8161787

Claim:
Tooling for the manufacture of a tab, the tab to be affixed to a can end, the tooling comprising: a rivet hole punch having a lower surface with a non-round perimeter that has a first diameter portion and a second diameter portion, the rivet hole punch being structured to form a rivet hole with a non-round perimeter; and a rivet die having a hole which is structured to receive sharpened edges located on the lower surface of the rivet hole punch, wherein the rivet die has sharpened edges located about an upper surface of the rivet die proximate to an outer periphery of the hole, wherein the first diameter portion ends in a plurality of first arcuate segments on the non-round perimeter, wherein the second diameter portion ends in a plurality of projections on the non-round perimeter, wherein the second diameter portion is greater in length than the first diameter portion, and wherein at least one of the first arcuate segments has an arcuate size which is different from an arcuate size of at least one other of the plurality of first arcuate segments.