M-35, 5% cobalt and extra thick drill core for optimum life and durability in hardened steel, super alloys, titanium and stainless steel applications, split point minimizes bit walk. All sizes 3/16 in and larger have three flats on the shank for a better grip on chuck.M-35, five per cent cobalt, and extra thick drill core for optimum life and durability in hardened steel, super alloys, titanium and stainless steel applicationsSplit point minimizes bit walkAll sizes 3/16 in and larger have three flats on the shank for a better grip on chuck 3/8 in reduced shank