11258619196 6x Engine Pistons Rings Set STD Bore 84mm for F20 F21 F30 F10 X3 X4 X5 X6 N55B30 N55B30A 3.0L L6 Twinturbo Parts Material: grade forged aluminum Bore Size: 84mm STD Wrist Diameter: Φ22mm Wrist Length: 54mm Ring Thickness: 1st 1.2mm, 2nd 1.5mm, 3rd 2.0mm Compatibility: N55B30/N55B30A 3.0L L6 (2979cc) Twinturbo OEM : 11258619196, 11257610297, 11257610298, 11257589824, 11257587914 This engine piston and rings set is designed for vehicles equipped with the N55B30/N55B30A 3.0L L6 Twinturbo engine.Constructed from grade forged aluminum, it supports strength and under stress operating conditions.The standard bore size of 84mm, combined with ring thicknesses of 1.2mm, 1.5mm, and 2.0mm, contributes to effective cylinder sealing, reduced oil consumption, and improved engine efficiency.The wrist pin diameter is Φ22mm with a wrist length of 54mm, matching specifications for proper fitment.This set is intended for use in models requiring OEM part numbers listed above.