Impact sockets and sets tighten and loosen fasteners in high torque applications. Bolt extraction sockets remove stuck, rounded, and rusted nuts and bolts. Flex impact sockets are hinged in the middle to access fasteners in tight spaces. Specialty impact sockets are for use with nonstandard fasteners. Power sockets deliver more speed and torque than a hand wrench while lug nut wrenches are used with lug nuts on automobile wheels.