BlueSpot SDS Masonry Drill Bits are manufactured from high quality heat treated carbide steel with a sandblasted finish and carbide tip for exceptional durability. Ideal for use on masonry, concrete, mortar, brick and stone. Package Contents - 7mm x 210mmManufactured from high quality heat treated steelSandblasted finish and carbide tip for increased durabilityFor use on masonry, concrete, mortar, brick and stone