A dependable, general purpose drill bit ideal for production, maintenance or portable drilling jobs. Features a left hand helix for screw machine applications where spindles rotate counter-clockwise. Left hand drills can also be used to drill out broken bolts. For use in a wide range of materials such as aluminum, bras+AW1547+AV1546:AZ1546+AV1546:AY1546+AV+AV1546:AY1546. Surface treated with abrasion-resistant black oxide