1. piston ring for compressor and other models 2.Treatment: phosphated, nitrided, chrome plated etc 3.OEM&design service offer 1.piston ring for cummins 6bt and other models(6ct,m11,nh220,nh250c,nt855,k19 etc);2.Material: nodular iron, cast iron, steel, alloy, and etc(we can do as customer's request);3.surface treatment: polishing, plating, oxidation, phosphating, and etc(we can do as customer's ...
