O.D of degree ring is 7.00", has 11 or 12 magnets 30 degrees apart with one magnet free pocket on the eleven magnet degree ring and is marked for an alcohol burning engine. Flat degree rings with magnets have a .200" flange offset giving them a slight concave shape.
Fits all RCD dovetail type spline crank hubs. Racer can choose between eleven or twelve magnets form drop down menu.