Set of 11 impact sockets. 1/2 in. SAE format. Made of high-quality forged steel and finished in high-polish chrome. Unique "Max-Drive" design provides 15% more torque to tighten fasteners easily and simplify the turning of rounded corners. Helps reduce fastener wear by minimizing contact on outer 5% of fastener; helping increase life expectancy. Helps reduce slipping on frozen or rusted fasteners. All Stanley ratchets and sockets are designed to meet or exceed ANSI specifications. Also available in metric format.