HMT VersaDrive Step Drill Bit InsertFoam Set: 1/2, 7/8, 1-3/8"The first step drill optimised for use with Impact Wrenches & Impact Drivers allowing the user to create holes in seconds. Featuring a spiral flute design with self starting drill tip, for fast, smooth drilling with a rotary drill or Impact Wrench and market leading 5mm thick drilling capacity. VersaDrive Step Drills have a patented nonslip, Hex shank suitable for use in any standard 1 2 drill chuck for cordless or Pistol Drills or used with a