CYLINDER WORKS GASKET SET STANDARD BORE 77MM HEAD AND BASE HONDA CRF250R 10-17Produced in the U. S. A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long lasting performance and leak prevention for your rebuild needs. Vertex? s replacement gaskets and seals are available as a top end kits, complete engine kits, or as an oil seal kit. Top end gasket kits: These sets include the head, base, and exhaust gaskets, valve seals, o rings and other gaskets to complete a top