Walter Surface Technologies SST+™ Reduced Shank Drill Bit, Fractional Jobber Length, 25/64 in Drill - Fraction, 5-1/4 in Overall Length, 2 Flutes, 3-7/16 in Flute Length, 3/8 in Shank, Round Shank, 135 deg Point, Split/Self-Centering Point, Right Hand Cutting Direction, HSS Cutting Edge, Cobalt, Bronze Oxide, Applicable Materials: High Tensile Steel, Mild Steel, Non-Ferrous Metal and Stainless Steel