Irwin Unibit #1 Step Drill Bit allows you to drill up to 13 different hole sizes with the same bit, from 1/8” to 1/2" (3.2 - 12.7 mm)

Eliminates the need to change drills when drilling round holes in thin materials

Each smaller size drill acts as a pilot for the next size

Made from industrial grade high speed molybdenum steel and is heat treated to assure maximum durability

Patented single-flute cutting edge assure true round holes and gives greater control through steps

Hex shank prevents slipping in drill chuck

SpeedPoint tip penetrates faster and prevents walking

Laser-engraved measurements with increments of 1/32" (0.8 mm)

Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic, and laminates

Includes 13 steps: 1/8" (3.2 mm), 5/32" (4 mm), 3/16" (4.8 mm), 7/32" (5.6 mm), 1/4" (6.4 mm), 9/32" (7.1 mm), 5/16" (8 mm), 11/32" (8.7 mm), 3/8" (9.5 mm), 13/32" (10.3 mm), 7/16" (11.1 mm), 15/32" (11.9 mm) and 1/2" (12.7 mm)