With a high-impact, carbide tip and elongated 4-flute design, DEWALT HIGH IMPACT CARBIDE SDS Plus Masonry Drill Bits deliver extreme durability and fast drilling. An open-head design enables quick material removal while working. Features High Impact Tip for Maximum Durability and Long Life Open Head Design for Faster M DEWALT DW5477-7/8" X 8" X 10" Rock Carbide 4 Cutter SDS+ Hammer Bit