Straight, Double Fluted Step Drill Bits from Klein Tools provide cleaner cutting and drilling. The aluminum titanium coating is 10 times more durable than steamed black oxide for longer bit life. 3/8-Inch hex shank is durable, and has a firm, positive grip. Laser-etched markings provide quick size identification on primary holes. This step bit has 3-hole sizes from 7/8-Inch to 1-3/8-Inch (22.2 to 34.9 mm).
- Step bits are coated with aluminum titanium nitride and are 10 times more durable than steamed black oxide coating for longer bit life 
- Double, straight flute removes chips for clean cuts and drilling 
- Durable, 3/8-Inch hex shank provides a firm, positive grip and won't spin out in the drill 
- Laser markings are easy to read for quick size identification 
- Fast-starting, non-walking drill tip 
- For use on steel (up to 16 gauge), wood, plastic, and aluminum 
- 7/8-Inch to 1-3/8-Inch (22.2 to 34.9 mm), 3-Step sizes