Irwin Tools IRWIN Step Drill Bit, 3/16-Inch to 7/8-Inch, 3/8-Inch Shank (10234)

Save time because you don't need to change drills for different-sized round holes in thin materials. Each drill acts as a pilot for the next size.

Made from industrial-grade high-speed molybdenum steel heat treated for maximum durability. SpeedPoint tip penetrates faster and prevents walking.

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

Non-skid tip, no need for center punches. 3-faltted hex shank prevents drill chuck slipping. Drill diameters etched in flute for easy identification.

Backed by a full lifetime warranty.