Proform's oversize 16'' Billet Aluminum Professional Degree Wheel is light weight yet durable, and features large, easy to read white numbers on a bright blue anodized background. This Degree Wheel can be used on most popular engines to find top dead center (TDC) and assure proper cam timing and lobe lift. Dialing in your engine just became considerably easier with this handy, easy to use tool from Proform's engine building toolbox.