1、Using 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、The spacer is a necessary component for loading, and its function is to lock the front assembly with a suitable spacer height. 4、There are 4 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. ​Item Type: Bike Headset Spacer Set Material: Aluminium Alloy Inner Diameter: Approx. 28.6mm / 1.1in External Diameter: Approx. 34.0mm/ 1.3in Thickness: 2mm / 0.1in 3mm / 0.1in 5mm / 0.2in 10mm / 0.4in Product Weight: Approx. 29g / 1.0oz Compatibility: Suitable for fork tubes with a diameter of 28.6mm / 1.1in 6 x Spacer