This 6-piece engine piston ring set features an 88mm bore diameter and is designed for use in vehicles equipped with the M276 3.0T engine, including models W205, W212, X166, and E400.The rings are engineered to meet standard dimensional and functional requirements for proper fit and performance.This product corresponds to OEM part numbers 2760300700 and 2760306517.It is suitable for engine rebuild and repair applications where sealing and compression are required.The components are constructed to match standard material and dimensional specifications for dependable in-service performance when correctly installed.