【Premium Quality】: Made of heat treated Chrome Vanadium Steel with black oxide coating, have good performance on normal torque compression resistance. 【Unique Design】: Allows greater flexibility for sockets and drive tools and maximizes the versatility of ratchets and sockets. Spring-loaded detent balls keep your sockets secure with through holes that allow the use of locking pins and rings. 【Product Size】: This set includes a wide range of adapters and reducers. It will add great versatility by including the following conversions and sizes 3/8" to 1/4" reducer, 1/2" to 3/8" reducer, 1/4" to 3/8" adapter, 3/8" to 1/2" adapter. 【Package Includes】:3/8" to 1/4" reducer X 2,1/2" to 3/8" reducer X 2,1/4" to 3/8" adapter X 2,3/8" to 1/2" adapter X 2