Tungsten carbide tipped (TCT) drill bits allow drilling into concrete, bricks, roof tiles, aerated concrete blocks, thin metal, aluminium, soft to medium hardness ceramic tiles, all wood types and PVC. Impact rated: Designed for use with impact drivers and all types of 3 jaw chuck tools like rotary drill/drivers and percussion drills. Hex shank up to 260mm total length, 3 flat shank on 400mm total length drill bits. White flute to identify the drill bit easily in the users tool box.