ZTTO New Aluminum Alloy Bicycle Bottle Cage W316 Material:Aluminum alloy Weight: About 41.5g Color: Black/Red/Blue/Orange/Green/Purple Package Contents: Bike Water Bottle Holder *1 Screw*2, Screw washer*2 Allen wrench*1 [NEVER LOSE ANOTHER BOTTLE] There is no compromise in its tight hold so there is no need to worry about your bottle flying out. If you are worrying about the bottle losing situation that happens on traditional top-load aluminum bottle cages, you will find the peace of mind here. [MASS COMPATIBILITY] Universal mounting holes design. Compatible with most bicycle frames. [BE AWARE OF THE SCRATCHES] Aluminum cages have it's pros and cons. Compare to plastic bottles cages, they are more sturdy, but it could more likely to scratch your water bottle, if you really care about your water bottle's paint, you can go for our nylon plastic version.