Our ½” drive sockets fit directly on to the crank shaft snout and key, and feature a flange and two tapped holes to attach our 8” degree wheel. Our Universal pointer has ¼”, 5/16” and 3/8” threads and installs into front cover bolt holes. You can find TDC, remove the Crank Snout Socket, make cam timing change, and reinstall socket/degree wheel assembly and not have to re-find TDC.