( EXTRA STRONG ) The impact adapter is made from heavy duty chrome molybdenum (CR-MO) steel for exceptional strength and flexibility.( LASTS FOR YEARS ) Black phosphate finish for maximum protection and durability.( INSTANT IDENTIFICATION ) The impact adapter features roll stamped markings to ensure permanent and instant socket identification.( ADAPTER CONVERSION ) Made exclusively for wrenches, ratchets and drivers to convert the size up or down.( SAFE TO USE ) Designed for use with a locking pin and ring to increase safety when working with pneumatic tools.