Bit is constructed of high speed steel for the best combination of strength, heat resistance, and wear resistance; 135-degree split point reduces feed pressure and allows for easier penetration without work hardening. Can be used with screw extractors. Carded.. Irwin Left Hand Drill Bit 3/8. Jobber Length. Black Oxide Or Corrosion Resistance. Heavy Duty Web Construction For Strength And Durability. 135 Degree Spilt Point