3-7/8; 8 point locknut socket Wheel bearing locknuts are easy to remove or install with these specially designed sockets Sockets are made of high-strength steel; openings resist Can be used with an extension and torque wrench to tighten the locknut as required This socket has 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. This item is a 3 pack of the base item OTC-1913.