Feature:1. Diameter of the headset is 31mm / 1.2in, the screw size is 31x10mm, and it is used with a 6mm hex wrench.2. It is suitable for most bicycles, mountain bikes and road bikes on the market.3. Made of high‑quality aluminum alloy material, it is strong and not easy to wear or break.4. It can not only fix the front tube of the well, but also make the look cooler and more fashionable in appearance due to the shape.5. The headset top cover and screw set make it more convenient to use, and it has high reliability and long service life.Specification:Item Type: Headset with Material: Aluminium AlloyHeadset Diameter: Approx. 31mm / 1.2inScrew Total Length: Approx. 31mm / 1.2inNut Diameter: Approx. 10mm / 0.4inProduct Weight: Approx. 15g / 0.5ozApplication: Suitable for bicycles, road bikes, mountain bikes Package List:1 xHeadset Top Cap 1 x ScrewNote:1. Please allow 1‑2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.