'H' CARBIDE Drill Bits, Solid Carbide USA Drill bits are for sale by Bisco Tool Supply at wholesale and bulk prices. Carbide Letter Drills are made of Solid Carbide. These Solid Carbide Drill Bits are designed for drilling abrasive materials such as cast iron, non-ferrous alloys, high silicon aluminum, copper, plastics, bronze, hard rubber and plexiglass. Solid Carbide Drills are for sale in Letter Drill Bit sizes, Numbered Drill Bit sizes, and fractional drill bit sizes. These Letter H drill bits have .2660 decimal equivalent, 2-1/8" flute length, and 3-1/2" OAL. Call Bisco sales staff toll free -1866-247-2635 with any questions on Drill Bits and Solid Carbide Drill Bits.