The Klein Tools KNECT system is an impact rated, cross-compatible driver and ratchet system for efficient driving tasks. The KNECT (S) Impact Socket Adapter Set includes four adapters: the square driver adapter connects 1/4-Inch square drive sockets to the KNECT (S) wrench, the impact adapter works with a 1/4-Inch impact driver, the dual drive adapter links flip sockets to ratchets, and the expander allows the KNECT (S) wrench to drive KNECT (M) sockets. 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.