Features Made from heavy duty chrome vanadium steel for durability and long service life. The surface is finished by electroplating and blackening, which ensures corrosion resistance. Adapter body is designed with a ball detent and a small hole to keep your sockets still and secure. There are total four socket adapters of different sizes in this set and you can use for various sockets. Small size, portable and easy to storage. Made from heavy duty chrome vanadium steel for durability and long service life. The surface is finished by electroplating and blackening, which ensures corrosion resistance. Adapter body is designed with a ball detent and a small hole to keep your sockets still and secure. There are total four socket adapters of different sizes in this set and you can use for various sockets. Small size, portable and easy to storage. Specifications: Material: Chrome vanadium steel Surface Finishing: Electroplating, blackening Hardness: 45±2(HRC) Color: Black Size: 1/2"(Male)--3/8"(Female) 3/8"(Male)--1/4"(Female) 3/8"(Male)--1/2"(Female) 1/4"(Male)--3/8"(Female) Package List 4 x Socket Adapters Package List