( 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.( ANSI STANDARD ) The impact socket is suitable for all applications within the workshop and automotive industry. Length: 3.07 inches.