Made to ANSI specifications, the IRWIN 326020 – 5/8 x 8 x 12 Straight Shank Masonry Bit with 1/2 shank, is the next generation straight shank hammer drill bit which delivers more performance than ever. The patented flute design speeds dust removal for fast drilling and long life, while the shot-peened finish increases surface durability reducing the potential for breakage. This offering of straight shank masonry bits demonstrated IRWINs commitment to the line and the professions who rely on them.