Teng M340521-6 Hexagon Socket 3/4in Drive 21mm

[ EXTRA STRONG ] The socket is made from chrome vanadium steel for strength and flexibility. [ INCREASED GRIP ] Satin finish for a better grip when handling the socket - perfect for oily environments. [ MORE TORQUE ] 6 point high torque design grips flat sides of a fastener, not corners, preventing round-off. [ INSTANT IDENTIFICATION ] The socket features roll stamped markings to ensure permanent and instant socket identification. [ SECURE DRIVE ] Ball bearing recess on the female end to grip a ratchet or extension bar securely.