Diablo DMARG1220-S5 Demon Red Granite Varbide Tipped Hammer Drill Bit SetDiablo's Speed Demon red granite carbide tipped hammer drill bit range provides one of the fastest and longest lasting drilling solutions on the market for concrete, masonry and stone. Highlights: 5 Piece Optimized with a unique brazing and hardening process, the carbide tip extends life and productivity, allowing users to drill fast, accurate holes The multi ground grip point tip design allows for aggressive starts that produce clean, fast holes This