Features: brand new and high quality brand new and high quality ANTI-THEFT. It is completely integrated with the bicycle. Great for preventing your bike from being stolen and makes it hard to notice or disable. DESIGN. The Air-Tags bike mount with ingeniously hidden-design and very-slim. It can also keep your Air-Tags dry when you are riding on rainning days or when you are washing your bike. EASILY FIND BIKE. Fix it on your bicycle frame with an Air-Tags, you can track your bicycle at any for time. (Air-Tags not include). FITS ON. Suitable for bicycle with a headset tube size of 31.8mm. RELIABLE QUALITY. This base is made of quality aluminum alloy and equipped with high-end screws,it is very stable and not easy to be loosened. Package Includes: 1 X Air-Tag Bike Mount Specifications: Color: Black Material: Aluminum Alloy; ABS Size: Approx. 38cm/1.49in Weight: Approx. 30gram note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!