This 6-set piston rings kit is designed for engines with a standard cylinder bore diameter of 84.00 mm and is compatible with the N55B30 and N55B30A 3.0L inline-6 twin-turbo engines.The kit includes piston rings with thicknesses of 1.2 mm (first ring), 1.5 mm (second ring), and 2.0 mm (oil control ring).It fits vehicles equipped with these engines from model years 2010 to 2017, including F21, F30, F10, X3, X4, X5, and X6 series.The wrist pin diameter is 22 mm and wrist pin length is 54 mm.OEM part numbers referenced for compatibility are 11258619196, 11257610297, and 11257610298.This kit is intended for standard specification (STD 0.00) applications and is not suitable for use with expanded or oversized cylinders.