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Vortex 21 Piece Drill Bit Index. The Vortex drill bits has a special tapered tip stays sharp up to 4 times longer than other specialty tip bits. Bit sizes 1/16" through 3/8" by 64ths. These mechanic length bits feature a 135 degree split point to keep the bits from walking on the surface. You will find them very useful for enlarging existing holes. The bits are recommended for cast iron, brass, sheet metal, plastic, mild steel, copper, hardened steel. These bits are produced by Norseman/Viking Drill in USA.
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