Made to ANSI specifications, the IRWIN 326019 - 5/8 x 3 x 6 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.