The Stanley® STMT80759 70pc Chrome Socket Set Socket Set is constructed of high-alloy steel and heat treated for increased performance. Stanley sockets feature the proprietary Max-Drive design, a unique radius corner design which provides 15 percent more torque, making it easy to tighten fasteners and simplifies the turning of rounded corners. This technology helps reduce fastener wear without contact on the outer 5 percent of the fastener, so fasteners last longer. This helps reduce slipping on frozen or rusted fasteners. This 70pc socket set meets or exceeds ANSI standards for sockets and ratchets. The 50pc socket set meets or exceeds ANSI specifications and are backed by a lifetime warranty.