Feature 1Aluminum alloy headset top cap bike fork expander bung for 1 inch(24.5mm) or 1.25 inch(28.6mm). 2Replaces conventional star nut and top cap, a must for bike steerers. 3Can be used repeatedly, bite tight, does not hurt the fork, a must-have for top-grade bicycles. 4Eliminating the risk of damage and providing added support to the fragile top edge of the steerer. 5Just use the hexagon wrench and then you'll get it installed in minutes.SpecificationFeature:<br> <br> <br> Aluminum alloy headset top cap bike fork expander bung for 28.6mm / 1.1in.<br> <br> Replaces conventional star nut and top cap, a must for bike steerers.<br> <br> <br> Can be used repeatedly, bite tight, does not hurt the fork, a must-have for top-grade bicycles.<br> <br> <br> Eliminating the risk of damage and providing added support to the fragile top edge of the steerer.<br> <br> <br> Just use the hexwrench and then you'll get it installed in minutes.<br> <br> <br> <br> Specification:<br> Condition: New<br> Material: Aluminum Alloy<br> Color: Black, Red, Blue, Golden (Optional)Outer Diameter of Stem Cover: Approx. 31.8mm / 1.3in<br> Weight: Approx. 50-55gCore Expansion Range: Approx. 22.2-25.4mm / 0.87-1.00in<br> <br> Package List:<br> 1 * Bike Stem Headset<br> .wang-edit-text{<br> font-family:'Arial' !important;<br> }<br> .wang-edit-text table {<br> border-top: 1px solid #000;<br> border-left: 1px solid #000;<br> }<br> .wang-edit-text table td,<br> .wang-edit-text table th {<br> border-bottom: 1px solid #000;<br> border-right: 1px solid #000;<br> padding: 3px 5px;<br> }<br> .wang-edit-text table th {<br> text-align: center;<br> }<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin