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4 pieces. Car Reamer. Fast Spiral. 3 Flats on shank. Special Hi-Tungsten tool steel, gold surface treated body and clearance for maximum lubricity. These reamers are especially designed for the reaming of structural steel plate commonly found in truck frames, rail cars, bridges, and pressure vessels. For use to enlarge previously formed or drilled holes. All tools are constructed with left-hand and spiral right-hand cut. The left -hand spiral eliminates the tendency of the reamer to pull itself into holes. The type 51-AG is the more aggressive of the two styles. It also will fit the needs of users who prefer a stop collar. Made in USA.
Includes sizes: 5/16, 3/8, 7/16, 1/2. Norseman Drill reamers should be ran at 1/2 the R.P.M. suggested for a corresponding twist drill size.