... Japan, South Korea, the United States, Taiwan and Hong Kong etc in a large quantity, which widely used in ... innovation.The main technical index of the products:a)Size: wafer diameter from 15mm to 300mm, wafer inside ... Polishing product thickness from 0.3mm to 25mmc)Length-wide size tolerance: ≤ 0.1mmd)Diameter coaxial degree: φ30mm ... service sincerely for the customer. different size optical windows