IRWIN #5 Unibit Self-Starting Stairstep Bit, 10-Step, 1/4" to 1 3/8" dia, 1/8" Depth - Drill 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.
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