Universal Fit This lightweight water bottle holder is designed to fit most sizes of bicycle water bottles. Specially designed for a cyclist, it allows you to access your water bottle while cycling with easy access at all times. NOTE If you receive your shipment and are missing the bike bottle pocket accessories, please inform us and we will follow up carefully. Safe and Stable The water bottle holder is suitable for bikes with predrilled screw holes, if the package you receive is missing screws, please contact us The water bottle holders have arms that wrap around the bottle for a secure and firm grip so you dont have to worry about it falling out during your ride on uneven trails. Ensure a full water bottle is securely attached while riding. Easy to Install With installation tools and two pairs of screws. Even if your kids install it. It takes less than 60 seconds to install these bike water bottle holders. Use a 3mm Allen key to attach the stainless steel screws to the bike rack. IMPORTANT Please check if your bike frame has threaded holes before purchasing. Colorful Design Has a nice finish that will not scratch or mark the bottle. Perfect color match to your frame. It is safer and more flexible, not only fits standard size bike water bottles, such as 20 21 ounce size, but also disposable water bottles or cola. Durable Quality The bike water bottle holder is made of high quality PC material, ultralight, only 35g, will not wear out the bike frame and is easy to install. Perfect for road, mountain, hybrid, touring and electric bikes