The IRWIN UNIBIT HSS Fractional Self-Starting Step Drill Bit is made of high speed steel. Hole sizes are permanently laser-etched on the inside of the flute and will not wear away for easy identification throughout the life of the bit. The bit features a quick change hex shank that secures easily in the drill chuck.
Features
Pilot Point Tip starts on contact for clean, accurate holes and reduces lock-up on breakthrough
No-Spin Shank eliminates the frustration of bit spinning in the chuck
Tapered web provides greater durability to reduce breaking
Size markings are located above the shank to prevent wearing away
