Diablo, 5 piece Speed Demon red granite carbide tipped hammer drill bit set. Set consists of one each 5/32" x 4" x 6", 3/16" x 4" x 6", 1/4" x 4" x 6", 5/16" x 4" x 6" and 3/8" x 4" x 6" hammer drill bits. Diablo'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. 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 range is impact strong for increased shank stability and durability in cordless and corded impact and drill drivers.