These standard flute car reamers are made of special Hi-Tungsten tool steel. They are especially designed for the reaming of structural steel plate, commonly found in car & truck frames, rail cars, bridges, and pressure vessels. For use only to enlarge previously formed/drilled holes. All reamer bits have 3 flats on the shank, and are constructed with left-hand spiral & right-hand cut. The left-hand spiral eliminates the tendency of the reamer to pull itself into the hole.
