This piston rings set features a standard 84mm cylinder bore and is designed for use in F20, F21, F30, and F10 vehicles equipped with N55B30 or N55B30A 3.0L L6 Twin Turbo engines (model years 2011–2017).Constructed from aluminum, the set includes rings with thicknesses of 1.2mm (1st), 1.5mm (2nd), and 2.0mm (3rd), optimized to maintain cylinder sealing and reduce oil consumption.The wrist pin diameter is Φ22mm with a length of 54mm, contributing to structural stability during.This set is intended for standard bore applications and is not suitable for engines with enlarged cylinder bores.It aligns with specifications for part numbers 11258619196, 11257610297, 11257610298, 11257589824, and 11257587914.Proper installation and routine maintenance are recommended to support long-term engine efficiency and performance in both daily and performance driving conditions.