Material: Made of high quality plastic. sustainable. light. does not tear the bike frame and is easy to install. Ideal for road bikes. of Mountain. hybrids. touring and electric. Adjustable: it is adjustable and fits most cylinders up to 45-80mm in diameter. You can turn the knob to adjust your bottle size. Next. just use an allen wrench to secure the cage to the screw holes on the frame. Anti-scratch design and easy installation: The smooth surface of the bike bottle holder protects your bike and wont scratch your bottle of water. Standard size bottle cage. fits most water bottles. It is an effective assistant for long-lasting cycling. Stable structure: ensures that a full bottle stays firmly in place while riding. whether youre driving fast on bumpy roads or trails. so you dont have to worry about it falling off while driving. If you have any questions about the product. please contact our customer service immediately. We will help you within 24 hours.