... vibration, smooth hole surface and long tool life, the effective of drilling is much better and quicker than the common drills ... ,Thread shank;5. One-touch shank, suitable for all types of magdriils like Nitto, hougen, jancy, alfra, bds, ruko, rotabroach; as ... one-touch types to be mounted and removed without the use of a tool; Jet Broach Annular Hole Cutter