1/8" Diameter, 2-3/4" Overall Length, 1/8" Shank Diameter, Hardened Steel Left Hand Drill. These drills are designed to drill broken bolts, freeze out plugs, bearing races, safes, shafts, gears, and other hardened industrial parts. They have a carbide tip and a tempered body. The left hand drilling motion often backs out broken bolts and screws rather than run them into the work peice.