This genuine Bik3d holder sits either between your water bottle and the bike frame or if you don?t have a bottle it sits on the frame using the existing bottle holder screw threads using supplied bolts.
Standard kit is supplied with 2 off M5 x 20mm & 2 off M5 x 30mm mushroom head Allen bolts
Once closed and in place the SmartTag is waterproof and secure
Here is a link to an independent blogger who has purchased and tested our water bottle AirTag holder:
https://www.jiribrejcha.net/2021/05/tern-gsd-water-bottle-bike-mount-for-apple-airtag/
Please note SmartTag shown in photo is not included.
If you are looking for an under-saddle SmartTag holder see our other eBay items for sale