HIGH MATERIAL:This impact adapter reducer set is constructed of heavy duty drop forged and heat treated chrome vanadium steel, Black oxide coating with bracket torque compression have superior strength and durabilityto meet standard operating conditions. PRECISION DESIGN:The spring ball bearings on each square head are securely locked in the socket to avoid slipping during use. ensure stability 4PCS SET INCLUDES: 2 reducers in 3/8” female to 1/4” male and 1/2” to 3/8”and 3 adapters in 1/4" Female to 3/8” Male, 3/8” to 1/2”, and 1/2" to 3/4 Inch to convert all your impacts to different size sockets. 3PCS HEX-SHANK SOCKET ADAPTERS:1/4-inch hex-shank extended adapters includes 3 standard drive sizes: 1/4", 3/8", and 1/2". , The adapters feature detent balls and chamfered ends to provide a secure fit into the sockets. WIDELY USED:Its a great ideal for drivers, wrenches and ratchets to convert size up or down for your automotive needs in the garage. HIGH MATERIAL:This impact adapter reducer set is constructed of heavy duty drop forged and heat treated chrome vanadium steel, Black oxide coating with bracket torque compression have superior strength and durabilityto meet standard operating conditions.