Product details:

1/4" - 1-3/8" #5 Unibit Step Drill By Irwin Tools - High speed steel fractional self-starting 10235 - Single-flute cutting edge for greater control through steps - 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 - Maximum material thickness - 1/8" - Hole sizes - 1/4" - 1-3/8" - Number of holes - 10 steps.