Annular Cutter Set, Imperial, 12 in Minimum Cutter Diameter, 118 in Maximum Cutter Diameter, 72 Pieces, HSS pDrillco ppBroach 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 cutp