* Tungsten carbide tipped (TCT) * 3 flat shank prevents drill bit slipping in chuck * Can be used in hammer and rotary mode * Red flute to quickly and easily identify the drill bit * For concrete, aerated concrete blocks, masonry, slate and granite. The drill bits are supplied with a 3 flat shank to prevent the drill bit slipping in the chuck. Red flute to identify the drill bit easily in the users tool box.