Featuring 8 sizes in 4 easy-to-carry sockets, this 5-Piece, 2-in-1 Impact Socket Set consists of the most common metric socket sizes used in electrical and construction work. Each impact socket features two coaxial spring-loaded sockets in one. The high-torque, 12-Point design is easier to position on fasteners including square ones. Includes a 1/4-Inch hex by 1/2-Inch adapter and convenient carrying case.