Product Description:1. Made of high-quality materials, durable, and easy to use2. The product comes with a wrench and two washers for easy installation3. Bike round seatpost size is 31.6mm 30.8mm and 27.2mm4. Also suitable for other brands, such as some models of Shanren ROCKNote:1. Due to the influence of various factors such as monitor brightness and light brightness, the actual color of the item may be slightly different from the picture displayed on the website.2. Please allow the data to have a slight manual measurement deviation.Material: NylonColor: Black (as pictured)Weight: about 19gSize: The inner diameter of the snap is 31.6mm/1.24in, and the inner diameter of the two washers is 30.8mm/1.21in and 27.2mm/1.07inProduct List:1 * Stand2 *Washers1 * Wrench