They are double-cut style and have rows of cutting teeth in two intersecting directions for fast material removal and a rougher finish.. Shapes include ball, cone, flame, tree and cylindrical. Solid Carbide Burs have a long tool life and faster cutting speeds than other substrates.
#2 Spiral Flute Screw Extractor and 7/64in Left Hand Drill Bit Kit Left hand drills can also be used to drill out broken bolts Each set comes with one spiral flute screw extractor and matching left hand high speed steel drill bit in a plastic pouch. Left hand spiral flute for removing broken material Left hand jobber drills are for general purpose drill construction.
#56 Solid Carbide Drill Bit Solid Carbide drills are used on materials such as cast iron, non-ferrous alloys, high silicon aluminum, copper, plastics, bronze, hard rubber, plexiglass, and other similar materials.