... steel with tungsten carbide tipped. Tungsten Carbide Tipped drill bits,carbide brazed drill bits.Milled from high carbon steel.Industrial grade tungsten ... drilling.Nickel-plated surface finish for fast, smooth performance.Hardened core for extra strength and reduced breakage.For use on rotary ... .For drilling in wood, stone, metal, plastic materials. Carbide tipped drill bit T.C.T drill bit