Features1Wide Compatibility: Suitable for mountain bikes and road bikes. This bike water bottle holder saddle mount adapter provides an innovative way to carry your water bottle, makes it easier for you to get your water bottle and refill it during your ride. Compatible with mainstream bike saddles. 2Extendable Seat Mount: The bottle cage adapter can support single or two water bottles to meet the water needs of long distance cycling. The double bottle mode can expand two bottle cage, the single bottle rack mode can expand one bottle cage in the middle, allowing for easy switching between single and double bottles. 3Multifunctional Design: In addition to installing water bottle racks, the extender also provides a reserved hole for using hook and loop tape to expand the installation of a bike tail bag, which largely utilizes the space on the back seat to carry more needed accessories. 4PC Material: Made of PC material, sturdy and reliable for long term use. Not easy to damaged and no need to be afraid of rain erosion. It is lightweight, providing a stable support for your water bottle. 5Easy to Install: Simple and convenient installation, no need for extra tools. The versatile design allows for easy switching between single and double bottle modes, providing flexibility for different cycling needs.SpecificationItem Type: Bike Water Bottle Cage AdapterMaterial: PCPackage List1 x Bike Bottle Cage Adapter6 x Accessories