Feature: 1. Made of high‑quality aluminum alloy material, it is environmentally friendly, strong and durable. 2. Light in weight and easy to install, it has the advantages of smooth surface and exquisite workmanship. 3. It has strong anti‑corrosion and durable. The surface does not fade and the color is beautiful. 4. There are 2 different sizes (2mm/3mm/5mm/10mm), you can adjust the appropriate height according to your own situation. 5. The headset spacer is perfectly suitable for 28.6mm/1.1in front stem fork of mountain bike, road bike etc. Specification: ​Item Type: Bike Headset Spacer Set Material: Aluminium Alloy Spacer Inner Diameter: Approx. 28.6mm / 1.1in Spacer External Diameter: Approx. 34.0mm/ 1.3in Steel Sunflower External Diameter: Approx. 31.7mm/ 1.2in Thickness: 2mm / 0.1in 3mm / 0.1in 5mm / 0.2in 10mm / 0.4in Product Weight: Approx. 56-57g / 1.9-2.0oz Compatibility: Suitable for fork tubes with a diameter of 28.6mm / 1.1in. Package List: 6 x Spacer 1 x Screw1 x Steel Sunflower1 x Top Cover