Material: Bike bottle holder made of high-strength, lightweight engineering plastic material and easy to install. which is light, strong and durable. No need to worry about it falling off while cycling. Anti-scratch design and easy to install: The smooth surface of the bike bottle holder will keep your bike safe and won't scratch your water bottle. Standard size bottle holder, fits most water bottles. It is an efficient helper of the long bike. Adjustable: it is adjustable and fits most bottles up to 55-85mm in diameter, you can turn the knob to adjust your bottle size, then simply use an Allen wrench to secure the cage into the screw holes of the frame. Structure Robust structure: ensures that a full bottle stPXCL firmly in place when riding, whether you're riding fast on roads or trails bumpy, so you don't have to worry about it falling off while riding. Specifications: Color: Black Size: About 8.5cm after stretching, about 5.5cm after shortening High quality plastic base with adjustable size Suitable for all types of bikes with mounting holes for water bottle cages Features: Convenient to fetch drink from bottle holder. Sturdy structure, prevent deformation damage. Suitable for most mugs and bottles like travel mug, companion mug. Ideal for different types of bikes to hold the bottle while cycling. High-strength engineering plastic material; Ultra light, durable. The diameter of the bottle cage can be adjusted, so it is suitable for holding water bottle, coke canister, mineral water bottle, etc. Package included: 2 x Bike Water Bottle Holder