The IRWIN Unibit No. 4 Step Drill Bit is a premium high-speed steel tool designed to drill 12 distinct hole sizes from 3/16-inch to 7/8-inch in 1/16-inch increments. Featuring a single-flute cutting edge, it provides superior control and produces clean, round holes in thin materials such as mild steel, copper, aluminum, and plastic. The innovative SpeedPoint tip ensures fast, self-starting performance without walking, while the 3/8-inch hex shank prevents slipping within the drill chuck for maximum torque transfer. Laser-etched size markings inside the flute remain legible throughout the life of the bit, making it an essential choice for professional electrical, HVAC, and plumbing applications.
Unibit Step Drill Bit, Fractional, Self-Starting, Unibit, NO 4, 3/16 - 7/8 in Diameter, 2 in Cutting Depth, 12 Steps, 1 Flutes, 3/8 in Shank, Hexagonal Shank, High Speed Steel, Silver Metallic, Applicable Materials: Aluminum, Brass, Copper, Laminates, Plastic, Stainless Steel, For Drilling Holes into 1/8 in Thickness Materials
Packaging/Shipping Size and Weight:
Length: 1" | Width: 3" | Height: 6.2" | Weight: 0.22 lbs