Features: 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. ?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 included: 6 x Spacer&nbsp 1 x Screw 1 x Steel Sunflower 1 x Top Cover