[ EXTRA STRONG ] The impact socket 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.[ GREAT GRIP ] 6 point high torque design grips flat sides of a fastener, not corners, preventing round-off.[ INSTANT IDENTIFICATION ] The impact socket features roll stamped markings to ensure permanent and instant socket identification.[ SAFE TO USE ] Designed for use with a locking pin and ring to increase safety when working with pneumatic tools.