This set includes 6 piston rings designed for the N54B30 3.0L turbocharged inline-6 engine with a 2979cc displacement.The rings are engineered for an 84.00mm cylinder bore diameter and are compatible with vehicles requiring OE part numbers 11257610295, 11257577586, 11257577581, 11257577582, 11257610296, 11257561698, 11257570405, and 11257577587.Intended for use in E82, E90, E60, 135i, 335i, 535i, and 740i models equipped with the N54 engine platform where a standard 84mm bore piston ring replacement is needed.