OTC's specially designed wheel bearing locknut sockets make wheel bearing locknuts easy to remove or install. 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. 6 point, 3 inch (flat to flat) opening size. Measure locknut from flat to flat to determine socket size needed. 5 inches deep to ensure spindle clearance. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits.