Features 1、Aluminum alloy headset top cap bike fork expander bung for 1 inch(24.5mm) or 1.25 inch(28.6mm). 2、Replaces conventional star nut and top cap, a must for bike steerers. 3、Can be used repeatedly, bite tight, does not hurt the fork, a must-have for top-grade bicycles. 4、Eliminating the risk of damage and providing added support to the fragile top edge of the steerer. 5、Just use the hexagon wrench and then you'll get it installed in minutes. Feature: Aluminum alloy headset top cap bike fork expander bung for 28.6mm / 1.1in. Replaces conventional star nut and top cap, a must for bike steerers. Can be used repeatedly, bite tight, does not hurt the fork, a must-have for top-grade bicycles. Eliminating the risk of damage and providing added support to the fragile top edge of the steerer. Just use the hex wrench and then you'll get it installed in minutes. Specification: Condition: Brand New Material: Aluminum Alloy Color: Black, Red, Blue, Golden (Optional) Outer Diameter of Stem Cover: Approx. 31.8mm / 1.3in Weight: Approx. 50-55g Core Expansion Range: Approx. 22.2-25.4mm / 0.87-1.00in Package List: 1 * Bike Stem Headset Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List