... hollow steel drill bits used for the rapid drilling of heavy steel profiles and to drill through steel much faster TCT Annular ... , smooth cutting;3. One-touch shank, suitable for all types of magdrills like Nitto, Hougen, Jancy, Alfra, BDS, Ruko, Rotabroach; as ... well as radial drilling machine, boring machine, milling machine. T.C.T Jet Broach cutters