This is a Replacement Head Gasket for the OS Max .15 CV (and CV-X) Engines. / / INCLUDES: One Head Gasket - This very thin metal gasket seals the gap between / the cylinder head and the crankcase. / / SPECS: Head Gasket: / Inner Diameter: 15.5mm (0.613") / Outer Diameter: 21.3mm (0.841") / Thickness: 0.1mm (0.005") / BBS 1/23/99 / ir/jl