Cobalt Steel left handed drill bits are designed to help remove broken bolts or studs, The flute pattern rotates to the left, to help back out the bolt or stud, To remove bolts or studs use in conjunction with screw extractors, Carded, Made from premium grade cobalt steel, 135 Split Point, starts cutting at the starting surface, 1"" Flute length, Use for extracting broken studs or bolts, ""Stubby"" mechanics length drill bit for additional strength, Size: 5/64"", SKU: ISN15095