brand new and high quality Features: If your bike front fork diameter 25.4mm,but ahead set stem Is 28.6mm, you can use this to convert. This adapter will allow you to fit a 25.4mm ahead style handlebar stem to a bike which has a 28.6mm thread less fork steered. At this point will be reduced casing installed to the installation of the installation of the aperture Made from machined aluminium. Specification: Material: Aluminum alloy Inner diameter: 25.4mm; Outer diameter: 28.6mm Color: Black Quantity: 1 Set Note: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Set of Handlebar Stem Shim (without retail package)