Description: 【Material】Our bicycle headset base is made of high quality aluminum alloy, which is very strong and not easy to wear and tear, you can use it for a long time. 【Easy to Instal】The bike headset spacer is lightweight and portable, easy to install and quick to remove, and suitable for most bikes. 【Application】Our bicycle handlebar headset spacer is fit for front stem fork of BMX, mountain bike, road bike, etc. 【Replace Part】A direct replacement part for the old or broken piece, great match to your bike. 【Bike Accessories】Useful accessory for bike enthusiast to DIY their bikes. proper fit to the tube of most bikes. Specification: Material: Aluminum Alloy Size Chart: inner diameter 39.8mm/1.57inch, outer diameter 50.5mm/1.99inch, inner diameter 29.9mm//1.18inch suitable for headphones up to 55 mm and 56 mm. Package Includes: 2 Bike Headset Sealing Spacer(2 Pack) Note: Please allow slightly errors due to manual measurement and different monitors.