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; for seat post, handle bar or for cross bar. It is suitable for road bike., MTB, folding bike and so on. Package Includes: 1 x Kettle Rack Conversion for Seat Specifications: Material:Aluminum Alloy Size: Approx.5x7.7cm/1.96x3.03inch Color:Black 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.