Connected Adapter C-frame forcing screw Plug 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 Plug only - OTC-specific CA6636-1 C-frame and C6636-2 Forcing Srew sold separately. Fits into hollow center of forcing screw and allows connected adapters to attach to C-frame for use (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).