This 1/2" thick phenolic riser for the Carter WCFB 4 barrel carb and will fit other models as well. Add a little performance to your machine the cheap way, and keep the heat away from the carburetor to solve the heat soak or carburetor boiling issues. Includes free studs, gaskets, nuts, and washers. If you have any questions please email us or call 608-637-7167 at Dashman's Hot Rod & Speed Parts.