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Size: Inner diameter 0.4 inch (10.2 mm) (3/8 use) Outer diameter 0.7 inch (17 mm) Length: 0.3 inch (7 mm) Material: Aluminum material (A-2017), Quantity: 2 pieces *We have a wide variety of other sizes available. Further processing is possible. For example, it can be used to adjust the space when replacing custom parts such as motorcycle mufflers, steps, seats, etc.