2-1/2"/63mm wide opening allows proper fitment on applications where CTA Tools part #4245 will not work, such as Ford F150 4WD. Features 5/8"-18 threaded opening to work with CTA Tools part #A490 Puller plus other standard pulling tools. Forged steel construction with black finish. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.