"Opti-Torque™ applies torque to fastener sides, not corners which allows more torque to fastener and longer life","Counter-Torque™ distributes the torquing stress uniformly throughout the socket, extending socket life","High-visibility to identify socket sizes at a glance with oversized laser markings (blue for metric) 3/8" DRIVE 15MM METRIC 6 POINT CHROME SOCKET - GREEN B15M6AG | Matco Tools