This is the Cylinder Head for the OS Max .50 SX Engine. This Cylinder Head holds the glow plug and and fastens to the top of the Crankcase (OSMG4310). FEATURES: Natural silver colored finish. Head Gasket is pre-installed. INCLUDES: One Cylinder Head and Head Gasket for the O.S. Max .50SX. REQUIRES: Fastening to top of crankcase and installing glow plug. SPECS: Height: 0.71" (18mm) Length and Width: 1.61" (41mm) Glow Plug Thread Size: 1/4-32 COMMENTS: Cylinder head bolts are not included. The head bolts are included with the Screw Set for the engine, use OSMG8743.OS EnginesPart OSM25204010