The Blue Spot Tools 7 PCE 160mm SDS Plus Drill Bit Set (5-12mm) is manufactured from high-quality heat-treated carbide steel with a sandblasted finish and carbide tip for exceptional durability. These drills have a carbide tip for increased strength. The carbide tip provides the drill bit with more durability due to the hardness of the head making them a lot tougher. Ideal for use on concrete, mortar, brick and stone. Includes sizes 5, 6, 6, 8, 8, 10 & 12mm.