CONCRETE SCREW BITS - For rotary or percussion drilling, resharpenable, chrome vanadium steel shank for enormous strength. Tip is blend of Tungsten Carbide and Cobalt.Withstands drill temperatures up to 1900 degrees. Applications: Masonry, ceramic tile, concrete, brick, fiberglass, glass, cast metals, hardened steel, granite, marble, plastics, and wood. For use with Tapcon Fasteners Round Tube.