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#21 USANumber Drill Bit USA Numbered Drill Bits HSS
21 Very Small Numbered Drill bit. USA Made Drills. Drill Bits made of High Speed Steel by Bisco of Florida. Numbered drill bits have a decimal equivalent,2-1/8 flute length, and 3-1/4 overall length. Call Bisco 866-247-2635 with any questions on numbered drill bits.