Durable & Super Lightweight The water bottle cage is made of high quality PC material, durable and lightweight, will not attrit the bicycle frame and easy to install. Great for road, mountain, touring and electric bicycles. Quick & Easy to Install Including 4 little Screws and 1 L-shaped Spanner, which is necessary for mounting, the screws are standard size for water bottle mounts to most of bikes with drilled holes. Quick & Easy to Install Including 4 little Screws and 1 L-shaped Spanner, which is necessary for mounting, the screws are standard size for water bottle mounts to most of bikes with drilled holes. Secure and Sturdy Bottle Retention System Ensures a full bottle stays firmly in place when riding. Fits most standard & over sized bike water bottles. Upgraded Design The water bottle holder has arms that wrap around the bottle for a secure and firm hold so you don't have to worry about it falling out during your ride.