"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 (red for SAE) 3/8" DRIVE 7/16" SAE 12 POINT CHROME SOCKET B142A | Matco Tools