4pcs Engine Piston Ring Set 11257618811 11258606459 11257640166 For 328i 428i 528i X3 F30 F10 N20B20A 2.0T Piston ring set designed for 2.0L L4 turbocharged engines with a compression ratio of 10:1.Fits engine models N20B20A, N20B20B, N20B20D, and N26B20A.Bore diameter is 84.00mm with a pin diameter of 22mm.Ring thicknesses are 1.2mm, 1.5mm, and 2.0mm.Standard 0.00 specification with no cylinder expansion required.Compatible with vehicle models including 125i, 220i, 228i, 320i, 328i, 420i, 428i, 520i, 528i, X1, X3, X4, X5, X6, and Z4 from production years 2009 to 2017.This set includes one complete piston ring set for four cylinders.Matches OE numbers 11257640166, 11257594453, 11258606459, 11258617082, 11257618811.Also corresponds to replacement part numbers NURAL 87-434600-00 and WILMINK GROUP WG1175839.