Description Bearing Locknut Socket - 4 In - 6 Pt Truck wheel bearing locknut socket has 3/4? square drive opening. Permits the use of an extension & torque wrench to tighten the locknut as required. Locknut removal & installation is simple, even when wide rim wheels are involved. A long extension may be attached to the socket to provide the necessary clearance. Socket is made of high-strength steel. Opening resists ?rounding out.?