Drillco 1" Depth Annular Cutter with Pin - Diameters 7/16" - 1-1/2"1" Depth of Cut High Speed Steel Annular Cutter with Pin, 3 4" Shank Broach cutting using Drillco cutters means you can produce large diameter holes efficiently and quickly with less energy, faster penetration, and less thrust. Rather than drilling out the metal with a solid drill, Drillco cutters remove only the periphery of the hole ejecting a slug at the end of the cut