Item Type: Bike Headset Spacer Set Material: Aluminium Alloy Inner Diameter: Approx. 28.6mm / 1.1inExternal Diameter: Approx. 34.0mm/ 1.3inThickness: 2mm / 0.1in3mm / 0.1in5mm / 0.2in10mm / 0.4inProduct Weight: Approx. 29g / 1.0ozCompatibility: Suitable for fork tubes with a diameter of 28.6mm / 1.1in .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1Using highquality aluminum alloy material, it is environmentally friendly, strong and durable. 2Light in weight and easy to install, it has the advantages of smooth surface and exquisite workmanship. 3The spacer is a necessary component for loading, and its function is to lock the front assembly with a suitable spacer height. 4There are 4 different sizes (2mm/3mm/5mm/10mm), you can adjust the appropriate height according to your own situation. 5The headset spacer is perfectly suitable for 28.6mm/1.1in front stem fork of mountain bike, road bike etc.