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. Tests show that a solid drill will take 3 minutes, 45 seconds to drill a 1-1/4The Nitro® ranges of Annular Cutters are made from Cobalt, offering even better performance over the standard HighSpeed Steel ranges.Carbide Tipped Annular Cutters maximize the performance of any Magnetic Drill Machine, delivering reamed-quality, bur freeholes in a fraction of the time of standard HSS Annular Cutters. Eliminates the need for costly pilot holes & step drilling. 3/4″shanks are univeral and fit most magnetic drilling machines including those with tool-less arbors and set-screw arbors.