84645 aka 2732976 is a Widia/GTD high performance 5/16-18 NC H5 2B, 3 Flute, EM-SS  Spiral Flute, Blind Holes, Blk.Oxide Coated, 2.72 x .47 x 1.13 x .318 for Stainless Steels and other gummy materials.