About size: Top cover 28.6mm (1-1/8")+ bolt M6x35mm+ sunflower core 26mm, suitable for front fork outside diameter is 28.6 mm (1-1/8 ") mountain bike, road bike, folding bike, etc Package Included: 1 x Matte Carbon Fiber Control Cap 1 1/8" ; 1 x Titanium Alloy Black Bolt M6X35mm; 1 x Black Star Nut(Material: iron). About weight：Ultra-light，the total weight is less than 12g, equivalent to 42% of the weight of aluminum of the same size, and the strength is unchanged while achieving lighter About use: Easy to disassemble, the set includes top cover + sunflower core + bolt, assembly and use, to create the best riding experience About after-sales: before the goods are sent out, we will carefully check the package, but due to the uncontrollable factors of logistics, resulting in quality problems in the transportation of products, please do not worry, you can contact us within 7 days, Yaruijia will provide you with free return or exchange services › See more product details