Features Electroplating Technology: The surface of each adapter is completed by electroplating technology and full black shape, so as to ensure flat surface and durability. Heavy Chrome -Plated Steel Material: The socket adapter is made of heavy chrome -plated steel material. It has a strong and long -term durability and a long service life. Designed With A Ball Detent: Sockets screwdriver adapter body is designed with a ball detent and a small holeto keep the socket stand still and fixes. It is a very practical accessory. Easy to Store and Carry: The size of these adapters is small and easy to store and carry; it is easy to store or store in the toolbox, which is very convenient to use. 4 Different Sizes: The black variable diameter sleeve has a total of four different semi -socket adapters. You can be used for various sockets, which can basically meet our needs. Description: 1.This is a durable 4 pcs socket adapter and reducer set. Heavy duty chrome vanadium steel construction is designed for use with drivers and wrenches. A black oxide finish makes each piece very durable. Spring loaded ball detent keeps your sockets still and secure. 2.There are a range of sizes to accommodate many socket or wrench combination including 1/2"(M)--3/8"(F), 3/8"(M)--1/4"(F), 3/8"(M)--1/2"(F) and 1/4"(M)--3/8"(F). 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 Includes: 4 x Socket Adapters Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List