Description:This is a 4 pieces of socket adapter and reducer set. Heavy dutychrome vanadium steel construction is designed for use with drivers andwrenches. A black oxide finish makes each piece anti-corrosion and verydurable. Spring-loaded ball detent keeps your sockets still and secure.Features:1. Socket adapters are made from heavy duty chrome vanadium steel fordurability and long service life.2. The surface of each adapter is finished by electroplating andblackening, which ensures corrosion resistance.3. Adapter body is designed with a spring-loaded ball detent and asmall hole to keep your sockets still and secure.4. There are four socket adapters of different sizes and you can usefor various sockets.5. Common size combinations multiply the range and capability of manysocket set.Specifications:Material: chrome vanadium steelSurface finishing: electroplating, blackeningQuantity: 4pcsWeight: Approx. 133gSize:1/2"(square hole)--3/8"(square head)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 Socket Reducers