Irwin Tools #4 High Speed Steel Fractional Self-Starting Unibit

 OVERVIEW: 

Unibit step drills from Irwin are the industry standard. Their single flute design results in a much more accurate hole than double flute bits. The SpeedPoint™ gets the hole started fast! Ideal for drilling holes in thin materials such as mild steel, copper, brass, aluminum, plexiglass, wood and laminates.