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How to put an order? 1, Choose the outer diameter and length, such as "coupling GFZ": if I favor to buy outer diameter 30mm and size 50mm, then I want GFZ-D30XL50. 2, Pls write the within diameter length at the order page. 3, If you cannot find the outer diameter and size size, pls want different size or contact the seller. Normal all size chart we will make for you. Hot item hyperlink