OTC 1961M Metric Truck Wheel Bearing Locknut 120mm, 8-Point SocketOTC 1961M Metric Truck Wheel Bearing Locknut 120mm, 8 Point Socket These sockets have a 3 4" square drive opening, permitting the use of an extension and torque wrench to tighten the locknut as required. Locknut removal and installation is simple, even when wide rim wheels are involved, since a long extension may be attached to the socket to provide the necessary clearance. Sockets are made of high strength steel; openings resist "rounding out."