4-piece piston ring set for N46B20B engine with cylinder bore diameter of 84.00 mm.Designed for naturally aspirated 2.0 L inline-4 engines.Compatible with models including E60, E87, E90, E81, E83, E84, E85, E91, E92, and variants equipped with N46B20 series engines (N46B20B, N46B20C, N46B20E, N46B20BD, N46B20CC, N46B20CD).Fits vehicles with engine code N46B20 2.0 L (1995 cc) naturally aspirated configuration.OEM replacement part numbers: 11257562451, 11257548001, 11257540067, 11257562457, 11257556435, 11257541469, 99772600, 40085600, WG1016344.Specifications: standard size (no cylinder bore expansion required), wrist pin diameter 20 mm, wrist pin length 50 mm, ring thicknesses — first ring 1.2 mm, second ring 1.5 mm, oil control ring 2.0 mm.Includes four pistons with corresponding rings.Compatibility Notice: This is an aftermarket product.Mention of brands is for fitment identification only.