- Perfect Fit & Compatibility: The Meijun bicycle headset top cap features a precise diameter of 31 mm and a screw size of 31 x 10 mm, designed for use with a 6 mm hex key. It is widely compatible with most bicycles, including mountain bikes and road bikes, ensuring a seamless fit and enhanced performance. - Premium Aluminum Alloy Construction: Crafted from high-quality aluminum alloy, this headset top cap is exceptionally strong and durable, resistant to wear and tear. Its robust design guarantees long-lasting reliability, even under the most demanding riding conditions. - Enhanced Stability & Style: This headset top cap not only securely repairs the front cross tube of your bike but also adds a touch of modern style with its elegant diamond shape. It enhances the overall aesthetics of your bicycle, making it look cooler and more fashionable. - Easy Installation & Convenience: The included headset top cap and screw set make installation quick and hassle-free. Designed for user comfort, it ensures a secure fit and offers high reliability, making it a practical addition to any bicycle maintenance kit. - Applications: Ideal for upgrading your mountain bike for rugged trails, enhancing your road bike for a smoother ride, or simply replacing a worn-out cap for better bike performance. This product is a must-have for any cycling enthusiast looking to improve their bike's functionality and style.