The Irwin Unibit® high-speed steel fractional self-starting step drill #5, 1/4" - 1-3/8", is ideal for drilling clean, smooth holes in mild steel, copper, bass, aluminum, plexiglass, wood, and laminate.
Crafted of high-speed steel, it has a speedpoint tip that guarantees fast starts and a single-flute cutting edge for drilling true, round holes with a precise step control for multiple sizes.
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.