"Opti-Torque(TM) applies torque to fastener sides, not corners which allows more torque to fastener and longer life","Counter-Torque(TM) distributes the torquing stress uniformly throughout the socket extending socket life","Hi-Visibility to identify socket sizes at a glance with oversized laser markings (blue for metric)","Made of new high strength material 3/8" DRIVE 9MM METRIC 6 POINT DEEP CHROME SOCKET BD9M6A | Matco Tools