For grip wrenches using single-lead thread adjusting screwAdapter threads onto a slide hammer with a 5/8"–18 threadGrip wrench threads onto 7/16"-l4 end of adapter for pulling useThis is usually included in most of the OTC puller kits. This tool has the ability to add more force when pulling. It threads onto slide hammer with 5/8"-l8 thread. It's very simple to use.