Baiyu Adjustable Bicycle Bike Water Bottle Cage Holder Rack Bracket Aluminum Alloy + Plastic Universal Drink Bottle Mount Carrier Cycling Handlebar Component Support Kit 5 Colors Material: high quality heat-treated aluminum alloy and plastic. Very durable, can stand with intense impact. Perfect design helps to strengthen its hold, keeps bottles securely in place during cycling. No worries it would drop from the bike. Designed for most standard water bottles. Easy to mount on your bicycle. There are wholes for screw to mount it to your bike. Adjustable, rotating the screw to adjust the size for your pipe. Size: 16.5 * 9.5* 7.6 cm of this product. 1 Piece in each package.