Irwin 10231 Unibit1 1/8-Inch to 1/2-Inch 1/4-Inch Shank Step Drill Bit

Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates | Single-flute cutting edge for greater control through steps | Patented single-flute cutting edge gives the user a true round hole every time | 3 faltted shank prevents slipping in drill chuck | New speedpoint tip penetrates faster than previous unibits and prevents walkingAmazon.ca Product Description Irwin 10231 Unibit #1 13-Step 1/4-Inch Step Drill Bit, 1/32-inch Steps (1/8- to 1/2- inches) Save time by eliminating the need to change drills when drilling round holes in thin materials. Each smaller size drill also acts as a pilot for the next size. Patented single-flute cutting edge gives greater control through steps and a true round hole every time. Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates. SpeedPoint tip penetrates faster than previous Unibits and prevents walking. 3-faltted hex shank prevents slipping in drill chuck. Drill diameters etched in flute for easy identification. From the Manufacturer UNIBIT 1 13 Hole Sizes (1/8"-1/2"), 1/32" Increments