Bulldog xtreme, 3/16" x 6" x 8.5", sds-plus, carbide, rotary hammer drill bit, carbide percussion bit, 4x life in rebar & 40 percent more life in concrete than competitive full head carbide bits, optimized for heavy duty rotary hammers, less carbide wear than 2 cutter means end user is more productive with each bit, no jamming when hitting rebar, diffusion bonding technology provides stronger carbide bond for longer lasting bit, wear mark assures accuracy of hole diameter, centric conical tip guides bit through concrete & provides rounder holes.