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No.4 satin machine for the The polishing of coils and sheets is one of the most value added operations offered by service centers. Perfect machinery is the key to success in every business, OUYIGANG grinding/ polishing machines are very easy to achieved Matt, Hair -Line, Satin, No.4,No.6 finish. OUYIGANG Metal Surface Polishing Machines can be applied to the top surface of coils and sheets. We are the leading company in the metal processing equipment , our machine cover more than 70% of the Chinese market and is going to meet the worldwide challenge with its extraordinary performance and innovative technology.