1. Secure and Sturdy : The water bottle lock design on the top and the two durable arms will keep the water bottle staying in secure condition. This secure mechanism will protect your water bottle stay sturdily, whether riding on the bumpy road or hitting berms,the water bottle will not drop out 2. Easy to Access:Two flexible arms combined the large openings to allow you to get the bottle in or out easily. You could pay more attention to riding,rather than get the water bottle,enjoy the riding 3. Premium Material: water bottle cage is made with alloy aluminum. Which is more durable than plastic or polycarbonate. With rubber paint,the surface from the water bottle holder is more smooth,which will keep your drink bottle and your bike frame from scratching. 4. Universal Fits:Bike water bottle holders arm that wrap around water bottle fits most standard and over sized bicycle water bottles,drink bottles, which including 20, 24, 25 & 33 oz ounces (500, 650, 750 & 950ml sizes)