The Klein Tools KTSB15 Double Fluted Step Drill Bit is your ultimate solution for cleaner cutting and drilling. With an impressive aluminum titanium coating that outlasts standard black oxide by tenfold, you can expect extended bit life and exceptional performance. The durable 3/8-Inch hex shank guarantees a positive grip, while the laser-etched markings provide instant size identification for holes ranging from 7/8-Inch to 1-3/8-Inch (22.2 to 34.9 mm). For over 160 years, Klein Tools has been synonymous with premium-quality, professional-grade hand tools, ensuring you have the performance, durability, and precision needed to complete your tasks efficiently. Our commitment to excellence is backed by generations of expertise and craftsmanship, making Klein Tools a trusted name in the industry. Invest in a tool that stands up to the demands of professionals—choose Klein Tools, where quality meets reliability.