Bulldog x-treme, 1/4" x 6" x 8-1/2", sds plus, carbide rotary hammer drill bit, diffusion bonding technology, provides stronger carbide bond for a durable, longest lasting bit, 100% full carbide head, delivers 4x life in concrete with rebar & longer life in all masonry drilling, variable flute design, supplies efficient material removal for 25 percent more holes per charge, centric conical tip, results in rounder holes for precision anchoring applications, wear mark assures hole diameter tolerance for anchoring, widest range.