"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 laser markings to identify socket sizes at a glance","Includes sizes: 6mm - 22mm","Color-coded socket rail features unique spring-loaded ball allowing easy socket removal and replacement","Packaged on a nylon rail 17 PIECE 3/8" DRIVE METRIC 6 POINT CHROME SOCKET SET SBM176TA | Matco Tools