IRWIN® Unibit has been the most innovative and trusted name in step drill bits since its invention in 1972. The new IRWIN® Unibit Cobalt is the latest addition to the step drill bit category. Made of cobalt high speed steel, this step drill bit will last longer in the toughest of materials. From stainless steel to aluminum or PVC pipe, the Unibit Cobalt is the most versatile and longest lasting step drill bit in the market.
Features:- 6X Longer life vs. the competition
- M35 grade Cobalt HSS
- Radial concave flute
- 3-Flatted shank
- Speedpoint(TM) tip
- Laser marked sizes
- 9 steps, 1/16" Increments
Unibit 10231CB Cobalt Step Drill #3 - 1/4" - 3/4" (1/16 In Steps) 
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