... engine piston ring set OEM manufacturer 2.Different Treatment: Phosphated, Nitrided,Chrome plated 3.ISO9002, QS9000, TS16949 engine piston ring ... set OEM manufacturer 1.Dia from 90mm---139mm2.Engine Type: W04D,EH700, M10U, EK100, ... & Japanese etc.Caterpillar, Cummins, Perkins, Komatsu, Mitsubishi, Nissan, Hino, Isuzu, Toyota, Daewoo, Hyundai, Kia, Volvo, Benz, MAN, ...