This 3-Piece impact socket set features 6 standard sizes in three color-coded sockets. Each impact flip socket features two coaxial spring-loaded sockets in one. Set includes Nested adapters for dual drive (1/4-Inch hex flip socket shaft nests into 3/8-Inch square drive adapter). Also comes with a compact, modular storage system with a clear lid that is compatible with MODbox and stackable with other cases of its similar design. 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.