Teng - Deep Impact Socket Hexagon 6-Point 1/2in Drive 21mm

[ 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.