Use with 1/2" drive tools and torque wrenchRefer to Ford factory service manual for torque specifications and thread directionWrench opening is 48mm (1.889")This is to be used in conjunction with the universal pulley holder(3471) to remove and replace the thermostatic fan assembly on Ford 6.9-L, 7.3-L and 7.3-L DIT diesel engines. Also available in a kit 41580.