#4 Unibit Self-Starting Stairstep BitDrill a range of holes without changing bits when you equip with a stairstep bit. SpeedPoint tip penetrates quickly and cleanly without the walking issues common among alternative point designs. Patented single-flute edge provides precise depth control though all size steps. Hex-shaped shank enables secure, slip-free lock-down. Self-starting bit may be used on stainless steel, copper, brass, aluminum, plastic, laminates and wood. Material(s): Steel.