Keep your hammer-drill armed and ready with these percussion drill bits. Specifically designed for blasting through concrete, stone and other masonry materials, these rugged bits feature thick carbide-tips and superior dust-extracting flutes that increase the efficiency of material removal. The DEWALT 3/16 in. x 6 in. Premium Percussion Drill Bit features a shank diameter of 3/16 in. This drill bit has a drilling depth of 4 in.