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[7 DIFFERENT SIZE TO CHOOSE] There are 7 different size seat post tube adapter for you to choose from [EASY TO INSTALL] It is easy to install and remove, convenient for you to use. [GOOD MATERIAL] The seatpost tube adapter is made of full CNC precision machining aluminum alloy material, anti-slip, light weight and can be used for a long time [WILD RANGE OF APPLICATION] The bike seatpost tube adapter is used with most s, for example bike, mountain bike, road bike, etc. [WARM-HEARTED TIP] Please check the outer diameter of your seat tube. Measure the inner diameter of the old clamp. Or measure the outside diameter of the seat tube. Then make the right choice.