Piston ring for Benz series: Dia from 87.00mm---130.00mm (e.g: OM352, OM355, OM422etc.) Perkins series: Dia from 91.491mm-137.17mm Remark: 1)For European& American, Korean & Japanese etc. Engines 2)Good quality 3)Competitive price 4)Secure service 5)products: Piston, piston ring, engine bearing, cylinder liner. Desire our cooperation