Sockets are engineered with the proper clearance to fit the yoke and locknut assembly on a wide variety of truck transmission and differentials. Sockets are 6 point and have 3 inches of usable depth. O.A.L.: 4�. Eliminates the need to grind or modify a standard socket to provide the necessary clearance. Black finish. Not to be used with an impact wrench. Sockets are 3/4� drive.2-1/2�