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The Models is M20. Please Understand the Size You Need before Buying. The Size that Does Not Match Can Not Be Installed. Suitable for 20mm Diameter Chainrings. Lightweight and sturdy Easy to Install: It Is Delivered With Screws and Can Be Installed on the Chainring With An Allen Wrench. High Quality: Made of Aluminum Alloy, the Surface Has Been Electroplated, High Quality and Sophisticated, Not Easy to Rust SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Contact Us.We Will Provide After-sales Service .