Ranging in bits sized 5.5 to 12mm, the NEW Faithfull 10 Piece SDS Drill Bit Set covers every requirement. These high-performance Faithfull Tungsten Carbide Tipped Drill Bits fit into SDS Plus chucks which provide a particularly secure non-slip grip, transmitting maximum power for rotary percussion drilling into mainly concrete. The SDS Plus bits ensure maximum power transmission due to their unique fluted shaft, which effectively removes situations where a perfectly serviceable cutting edge is rendered useless by a worn shank. The SDS Plus system also enables faster changing of drills using a quick release keyless chuck. For use on bricks, blocks, concrete containing aggregates, marble and hard stone, and other hard masonry materials too.