COMPATIBILITY: One bracket holds two bottle cages. This saddle mount adapter is compatible with most bicycle seats on the market and is designed for Road Use ONLY. Compared to placing your bottle on the bike frame down tube or seat tube, this saddle mount adapter offers the advantage of being easy to reach while freeing up valuable space on your bike frame for other accessories like a pump or toolbox. ADJUSTABLE ANGLES: The adapter can be easily adjusted to any angle, allowing for more convenient access to your water bottles. It provides a new way to carry your bottles, making the most of the space behind your saddle while riding. The width between the clamps is also adjustable for a customized fit.