Heavy duty chrome-vanadium steel construction is designed for use with spanners and wrenches. Socket adapters are made of tough chrome-vanadium steel for longevity and the long service life. The surface of each adapter is finished by electroplating and blackening, which ensures corrosion resistance. The body of the adapter is designed with a spring-loaded ball detent and a small hole to keep your outlets stationary and secure. Get the most out of your sockets with this handy set of adapters and reducers that ensure youll always have the right size for the job There are four socket adapters in different sizes and you can use for different sockets. Can meet your different needs. Features: It is a set of 4 socket and reducer adapters. Heavy-duty chrome-vanadium steel construction is designed for use with spanners and spanners. A black oxide finish makes each piece corrosion resistant and highly durable. Spring loaded ball detent keeps your outlets stationary and secure. Specifications: Material: Chrome Vanadium Steel Surface finish: electroplating, blackening Quantity: 4pcs Color: black Size: 1/2 (square hole) - 3/8 (head square) 3/8 (square hole) - 1/4 (square head) 3/8 (square hole) - 1/2 (square head) 1/4 (square hole) - 3/8 (square head) Package includes: 4 x tap reducers