Klein 4-In-1 flip quad socket includes 4 hex sizes combined into one tool and one nested adapter. The sockets are designed for use with impact wrenches. Easy-to-use flip feature allows for quick changes between sizes and reduces the number of tools in the tool bag. 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.