Connected Adapter C-frame forcing screw works with 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 Srew only - OTC-specific CA6636-1 C-frame 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 CA6636 Connected Adapter C-frame Kit, CA7149 Connected Adapter Ball Joint Starter Kit, and CA6630 Connected Adapter Ball Joint Professional Kit (kits not included). Always ensure threads are greased before use to prevent galling and damage that can shorten component life.