Professional Socket and Bit Set are forged from high-quality steel and finished in high-polish chrome. Each ratchet handle is ergonomically designed and has an easy-to-use, thumb operated reverse-switch mechanism. Sockets and extensions remain locked onto the drive until disengaged with an easy-to-reach, low-profile quick-release button. Stanley sockets feature our Max-Drive design, a unique radius corner design which provides 15-Percent more torque to tighten fasteners easily and simplify the turning of rounded corners. Helps reduce fastener wear by minimizing contact on outer 5-Percent of fastener; helping increase life expectancy. Helps reduce slipping on frozen or rusted fasteners. All Stanley ratchets and sockets are manufactured globally, and are designed to meet or exceed ANSI specifications.