Shop for Power Tool Accessories . This set features High Speed Steel Unibits #1, #4, and 7pc Titanium Nitride Coated Turbomax drill bits(10231, 10234, 7 pieces Turbomax). The Unibit's single-flute design drills true, round holes every time and gives the user ultimate control over the drill progression. Turbomax tip geometry is precision ground to self-center, drill faster, and stay sharp longer. The Titanium Nitride coating extends cutting edge life up to 6X.