High-quality material made of 6061-T6 heat-treated aluminum alloy, rust-resistant, ultra-light, durable and strong, ideal for professional and amateur riders. Small size (14 x 8.5 x 10 cm) and light weight (51 g). Anti-scratch and anti-rust design: There are wheels on both sides of the bottle holder to prevent the water bottle from being scratched. Standard size bottle holder that fits most water bottles. Anodized material means bottle racks won't rust. No matter what weather it is exposed to or how long it is used, it will never rust. EASY INSTALLATION: Just use an Allen key to fix the bike bottle holder in the screw holes of the bike frame. PLEASE NOTE: Threaded holes are required in the bike frame for ease of installation. The perfect design enhances the grip and holds the bottle securely while riding. Don't worry, it might fall off the bike. Compatible with our stylish bike water bottle holder for almost all standard water bottles and water bottles. y Can be flexibly adjusted and adjusted to fit the right water bottle and can be stretched easily. Fits a variety of water bottles up to 60-85mm (2.4-3.3") diameter. It is a good helper for long-distance riding. Package includes: 2 bicycle bottle holders, 1 Allen key, 4 screws. Bike cup holders fit all types of bikes, including road bikes, mountain bikes, and folding bikes. It is also the ideal companion for weekend trips or daily training.