Two tools in one small end fits Ford 1986 to 1994 light trucks with Dana 44 front axle. Large end fits 1985 and newer Ford F150 - F350 trucks with the Dana 80 full floating rear axle. Press tool into lock nut and rotate to release the ratchet inside the lock nut. A torque wrench is used when installing. Use with 1/2 inch square drive.