Connected Adapter C-frame forcing screw works with OTC connected adapters to securely click into frame for easy removal and installation of ball joints, U-joints, bushings, and more on wide range of vehicles including 3/4 and 1 ton models Forcing Screw only - OTC-specific Connected Adapter C-frame CA6636-1 sold separately Hollow center for use with additional specialty inserts (inserts sold separately) Rugged, high quality materials ensure high strength and a long service life Included with OTC's CA6636 Connected Adapter C-frame Kit, CA7149 Connected Adapter Ball Joint Starter Kit, and CA6630 Connected Adapter Ball Joint Professional Kit (kits not included)