New heavy duty riser gasket kit for all common log style exhaust manifolds. 1/8" thick gasket material for extra sealing power. Kit includes (4) riser gaskets and (2) intermediate 1/8" thick stainless steel intermediate plates. Highly suggested to use RTV silicone when installing these riser gaskets. 5" OD X 3" ID, standard 4 bolt pattern. Fits Glenwood, Nicson, Hardin, Harman, Panther, Edelbrock and other log style manifolds. There are some odd sized log manifold flanges out there, so please be sure to check your flange dimension. Sold as a set as pictured.