Practical Bike Bottle Cage Adapter Lightweight Portable Bottle Cage Adapter for MTB Bottle Cage Mount Adapter Adjustable Features: It ensures high strength and stability because it is designed with CNC machining. What makes it wear resistant and anti rust is the aluminium alloy structure design. It enables water bottle to be installed on the bike easily if you have this product. Since it is compact and lightweight, it is easy to store and carry. It is constructed of aluminium alloy material. Your bicycle water bottle holder mount is a 90 degree adjustable adapter, so you can mount it horizontal or vertical; seat post, handle bar or cross bar. It is suitable for road bike., MTB, folding bike and so on. Specifications: Material:Aluminum Alloy Size: Approx.5x7.7cm/1.96x3.03inch Color:Black Package Includes: 1 x Kettle Rack Conversion Seat Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.