The distance between the holes is 65-67 mm. The bracket can be rotated 90 degrees to suit the installation position. You only need a few minutes to complete the installation. Durable and Solid: This water bottle holder is made of aluminum to withstand harsh conditions. Lightweight, no rust, no fading, long lasting. Excellent add-ons: Maximizes the use of space, two pairs of adapters included to perfectly fit your bike. Shockproof with maximum firmness. When riding a bicycle, Bottle Holder Adapter can make it easy and quick for you to get your water bottle. Safe and Sturdy: The bike bottle holder is very convenient to quickly remove the bottle holder, but when you ride on bumpy and rough roads or want to ride quickly, the bottle holder will be firmly fixed in place. Wide Compatibility: Bottle cage adapter is compatible with almost all types of bikes. You can mount it on any seat post or tubular handlebar with a diameter of 16 to 36 mm. The bicycle bottle holder is also suitable for most baby strollers, buggies, umbrellas. Scope of delivery:Bottle holder adapter*1 Warm tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement etc, there may be some slight differences in the color and size between the photo and the actual product. Sincerely hope you can understand! Thank you!