Baiyu 2 PCS Bicycle Water Bottle Cage Holder Rack Bracket Lightweight Aluminum Alloy Cycling Bike Handlebar Drink Bottle Carrier Support 2 Colors- Black/ Silver Made from lightweight heat-treated aluminum alloy. Each piece weighs only 51g. Very durable. Perfect design helps to strengthen its hold, keeps bottles securely in place while providing easy access for riders. Designed for most standard water bottles. It is also suitable for normal mineral water bottles. Easy to install on your bicycle. There are wholes for screw to install it to your bike. Size: 15 * 7.5cm. 2 Pieces in each package. Send 2 screws for installing it to your bike.