Klein's 66060 is a 6-Piece Impact Socket Set that features 12 sizes in 6 easy-to-carry sockets and consists of the most commonly used impact socket sizes for electrical and construction work. Each impact socket features two coaxial spring-loaded sockets in one. The high-torque, 6-point design is easier to position on fasteners including square ones. Includes a 1/4-Inch hex by the 1/2-Inch adapter and convenient carrying case.