Product DescriptionKlein has the nut drivers professionals demand to get the job done. The full hollow shaft facilitates work on stacked circuit boards or other long bolt applications. Premium chrome-plated for smooth feel and corrosion resistance. The handle end is color coded for easy identification. The patented Tip-Ident quickly identifies nut driver and size. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.From the ManufacturerSince 1857, the company operated by Mathias Klein and his descendants to the fifth generation, has grown and developed along with the telecommunications and electrical industries where Klein pliers first found major usages. Today, Klein Tools, Inc. represents much more than Klein pliers. The company's product line has broadened to include virtually every major type of hand tool used in construction, electronics, mining, and general industry in addition to the electrical and telecommunications fields. Klein offers a lifetime warranty on material defects and workmanship for the normal life of the product. The Klein 630-5/16 5/16-inch Cushion-Grip Hollow-Shank Nut Driver has professional extra-quality features that have made the Klein name famous for hand tools. With a 5/16-inch hex tip, the 3-inch hollow shank is exceptionally strong and made of carefully heat-treated and tempered steel for wrench-assisted turning. The shaft has internal flanges that provide an extra-strong, torque-proof anchor in the handle and will not bond or twist in normal use. The Cushion-Grip handle is yellow color coded and resists slippage which allows you to apply greater torque. The patented Tip-Indent quickly identifies the type of screwdriver and screwdriver tip orientation. With a standard length for most applications, this nut driver fits over long bolts and studs. This Klein driver has an overall length of 6-3/4 inches (171 mm) and meets or exceeds applicable ASME/ANSI specifications. The Klein 630-5/16 5/16-inch Cushion-Grip Hollow-Shank Nut Driver is sold one item per package.