Wheel bearing locknuts are easy to remove or install with these specially designed sockets OTC wheel bearing locknut sockets are formed from high-strength steel that is resistant to rounding out under high torque loads Designed for use with 3/4 inch, square-drive MANUAL tools only NOT intended for use with impact tools - use with impact tools will void the socket's warranty 8 point, 3-1/4 inch (flat to flat) opening size with 5 inch depth; to determine socket size needed, measure locknut from flat to flat