This is a replacement part for the O.S. FT-160 twin cylinder four-stroke / engine. / / This Package Includes: / (2) Head gaskets - this is the thin metal gasket that seals the gap between / the crankcase and cylinder head and also sets the head gap. / / Specifications: / Inner Diameter: 28mm (1.10") / Outer Diameter: 32.5mm (1.28") / Thickness: .410mm (.0162") / / JBN 4.4.94 *8)