1This is a set of 4 pieces socket adapters specially designed for impact driver or wrench conversions 2Spring-loaded detent balls securely latch onto sockets, preventing them from being dropped 3Constructed of heavy duty heat treated chrome vanadium steel for superior strength to endure all conditions 4With highly durable electrophoresis black coating finish, it is corrosion resistant to eliminate chance of rust for a long lasting time 5Common size combinations multiply the range and capability of many socket set Features: This is a set of 4 pieces socket adapters specially designed for impact driver or wrench conversions. Spring-loaded detent balls securely latch onto sockets, preventing them from being dropped. Constructed of heavy duty heat treated chrome vanadium steel for superior strength to endure all conditions. With highly durable electrophoresis black coating finish, it is corrosion resistant to eliminate chance of rust for a long lasting time. Common size combinations multiply the range and capability of many socket set. Specifications: Condition: 100% Brand New Material: CRV Chrome Vanadium Steel Surface Treatment: Electrophoresis, Black Color Size: 1/2''-3/8"(12.7mm Female to 9.53mm Male 3/8"-1/4"(9.53mm Female to 6.35mm Male 3/8"-1/2"(9.53mm Female to 12.7mm Male 1/4"-3/8"(6.35mm Female to 9.53mm Male) Quantity: 4Pcs Weight: Approx. 133g Package Included: 4 * Socket Adapters