Instead of traditional star nuts and top caps, bicycle guides must. Perfect tools to help you replace old broken bicycles, useful accessories. Specification: Weight: Approx. 50-55gMaterial: Aluminum Alloy Color: Black, Red, Blue, Golden (Optional)Outer Diameter of Stem Cover: Approx. 31.8mm / 1.3inCore Expansion Range: Approx. 22.2-25.4mm / 0.87-1.00in Package List: 1 * Bike Stem Headset This headset top cover expander suitable for 1 Inch(24.5mm) / 1.25 Inch(28.6mm). This is a necessary tool for bike steering accessory. Four colors for you to choose ! This bike stem headset adopts aluminum alloy material which is anti-corrosion and durable to use. You just need to use the hexagon wrench and then you'll get it installed in minutes, which makes you enjoy your riding. This road bike headset eliminate the risk of damage and provide support to the fragile top edge of the fork which give you a secure riding experience.