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.

• Geometry of single-flute cutting edge drills true, round holes and provides maximum step control.
• Hex shank prevents slipping in drill chuck
• Also available with (TiN) coating for longer life
• New SpeedPoint tip penetrates faster than previous Unibits and prevents walking
• Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates