VersaDrive Reamers perform the fastest and with less kickback when adapted for use with an Impact wrench for enlarging holes in steel plate. However, they can also be used in any standard 1/2" cordless or pistol drill chuck or adapted for use in a slow speed Magnet Drill. Ideal for site fitters, steel erection, machinery installation etc. Precision 6-Flute design for smooth cut on structural steel. Safer reaming with minimal kickback; specially hardened for impact wrench use. High Grade Tool Steel with ground flutes for high accuracy & long life. GoldMax low friction Titanium Coating to stop heat burn out. High Strength, Non slip shank design.