IRWIN 10313ZR 13 1-1/8" - Single Hole Size

Unibit #13 HSS Fractional Step Drill Bit (10313ZR) by IRWIN. IRWIN step drill bits are ideal for drilling holes in just about any type of thin material. General purpose high speed steel UNIBIT step drill bits are perfect for use in mild steel, copper, brass, aluminum, plexiglass, wood, and laminate. Titanium Nitride-coated (TiN) bits resist heat and friction, which extends the life of the cutting edge six times longer than standard step drills. And, Cobalt step drill bits are engineered with M35 Cobalt steel for maximum life when drilling in the toughest steel, including stainless steel. Most UNIBIT step drills are designed with a SpeedPoint tip that guarantees fast starts. They're manufactured with a single-flute cutting edge that drills multiple sizes of true, round holes with precise step control. Plus, the hole sizes are permanently laser-etched on the inside of the flute, so they can be easily identified throughout the life of the bit.

Irwin is a leading manufacturer of professional grade hand tools and power tool accessories for trade professionals who demand superior performance and durability on the job. For over a century, innovation has been the hallmark of the company. Beginning in 1885, with the development of the first Irwin auger bit, Irwin has been at the forefront of the industry, creating superior tools for the professional tradesman. The company's impressive track record of new product development is born from their passion for understanding the needs of their primary user - the professional tradesman. The company's dedication to improving products begins in the field, where Irwin's impact end-user teams visit job sites. There, the team learns first-hand how to improve their products to help the pros increase their productivity. Each Irwin product is made using the highest-grade materials to offer exceptional strength and provide many years of reliable performance.