This is the Cylinder Head for the OS Max .15 LA Engine. FEATURES: Painted Blue aluminum. INCLUDES: One Fin Style Cylinder Head One Aluminum Cylinder Head Gasket SPECS: Height: 11.5mm (.45") Length: 27.5mm (1.08") Width: 27mm (1.06") Glow Plug Threads: 1/4-32 COMMENTS: Cylinder head bolts are not included. The Head bolts are included with the screw set for the engine, use OSMG8648. NNA 12/23/01