WUZHOU [Material]Made of high-quality aluminum alloy, high strength, not easy to wear, corrosion resistance, non-rust, light weight, long service life [Size]Most mountain bikes and bicycles on the market can be used, with a wide range of applications [Easy to Install]Simple installation and disassembly, suitable for DIY and modified vehicles [Usage]For placing inside a suspension fork steering tube to which the headset bolt will attach. Quantity delivered: 10 pieces Package Contents: Only the above package contents, excluding other products. Size: 1.6*2.6cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: Black (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)