SKYWEL Machinery CO., Ltd, is a leading manufacturer of Piston Rings in China since 1943. Piston rings diameter range from 20mm to 1080 mm. Fit for Marine Diesel Engines, Diesel Generators, Gas & Diesel Engines, Locomotive, Pile Hammers, etc. Custom order/Special order with over size also be acceptable. Producing piston ring with certification of ISO 9001:2008 and strict Goetze Standard, to ensure every pieces of piston ring in high quality and be accepted by world market.