"Improved mirror like surface finish and high strength alloy","New, high visibility laser marking helps technician identify sockets quicker","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 1/4" DRIVE 3/8" SAE 12 POINT DEEP CHROME SOCKET AD122A | Matco Tools