The information below is per-pack only Secure and Sturdy: The water bottle cage is suitable for bikes with pre-drilled screws holes, if the package received is missing screws, please contact us! The water bottle cages 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 you ride on bumpy trails. Make sure a full water bottle is securely fastened while riding Wear-resistant Quality: The bike water bottle holder made of high quality PC material, ultra-light, only 35g, will not attrit the bicycle frame and easy to install. Great for road, mountain, hybrid, touring and electric bicycles Easy to Install: With no-charge installation tool and two pairs of screws. Even if your kids go to Install. It takes less than 60 seconds to install these bicycle water bottle holder. Use an 3mm Allen wrench to secure the stainless steel bolts to the bike rack. IMPORTANT: Check if your bike frame has threaded holes before you buy Universal Fit: This lightweight water bottle holder is designed to fit most sized of cycling water bottles. Specifically designed for a cyclist, it allows you to access your water bottle while riding easy access at all times. NOTE: if you receive your shipment and are missing bicycle bottle pocket accessories, please inform us and we will follow up closely Colorful Design: Has a nice finish that doesn't scratch or mark the bottle. Perfect color match to your frame. It is more safer and flexible, not only suit for standard size bike water bottles, likes 20 21 ounce size, but also the disposable water bottles or coke