Description: *MTB Bike Se at Post Shim Tube Sleeve Reducer Se atpost Converter Adapter *Fit for 22.2/25.4/27.2/31.6/33.9 hole diameter se at tube *The se atpost adapter spacer helps you to change the outer diameter of your se at tube, you can easily adjust the diameter of your se atpost without the hassle of repurchasing se atpost. How to choose a specification? 1. Measure the outer diameter of the se atpost 2. Measure the inner diameter of the middle tube of the frame Specifications: *Material: Aluminum Alloy *Color: Black *Weight: about 25g *Size: 60mm (34.9 height 40mm) *Optional model: 22.2 to 25.4, 25.4 to 27.2, 25.4 to 28.6, 27.2 to 28.6, 27.2 to 30.4, 27.2 to 30.8, 27.2 to 31.6, 27.2 to 33.9, 31.6 to 33.9, 33.9 to 34.9 Package Includes: 1x Se at Post Tube Shim Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Compatibility - Se at Post Tube Shim Se atpost Sleeve MTB Bike Reducer Adapter Converter Good Performance Materials - These bike accessories are made of premium material, ensuring their durability and long-lasting performance. Optimal Performance - These accessories offer versatility and adaptability to different cycling needs and provide optimal performance and reliable functionality enhance the riding experience and ensure safety. Easy Installation - These accessories can be easily installed on your bike to get your bike running again. After-sale Serive - We provide high quality products, if there is any problem with our product, please contact us.