... .Engine piston ring, auto piston ring 2.Different treatment:Phosphated, Nitrided etc. 3.ISO9002,QS9000,TS16949 Piston Ringpiston ring for Isuzu ... , V21C, V22C, F17C, F17E, V22D, F20C, V25C, V26C, F21C.Isuzu piston ringC220, C221, C240, C190, C223, 4JB1, 4JH1, 4BA1, DA120 ... , DA220, GD150, DA640, 6BD1, 6BB1, 4BB1, 6BF1, 6BG1, 6BG1MTC, 4BE1, 6BG1-TC, 4BG1, 6HE1, 6HE1, 4HE1, 4HF1, 12PA1, 4HG1, 4JH1 ...