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 Made from high-quality aluminum alloy, this headset spacer set is durable and environmentally friendly. Lightweight and easy to install, it features a smooth surface and precise craftsmanship. The spacer plays an essential role in adjusting and securing the front assembly by providing proper height alignment. Includes four different thicknesses (2mm, 3mm, 5mm, 10mm) to allow customizable stack height based on rider preference. Designed to fit perfectly on 28.6mm (1.1in) steerer tubes, this spacer set is compatible with mountain bikes, road bikes, and other bicycles using standard fork tubes.