Ainiv Bike Water Bottle Cage with BPA-free 800ml/28oz Bike Bottle(Green), Black Gloss Strong Bike Water Bottle Holder, Bicycle Cup Holder, Cycling Bottle Holder for Road Bike and Mountain BikeEASY TO INSTALLThe bottle holder is equipped with two screws and an Allen key. Use the screw to fix the bottle holder to the hole on the bicycle frame. Please note that the bicycle frame require the matched holes to attach the bottle cage during the installation. LIGHTWEIGHT & PRACTICALThis bicycle bottle holder only weigh 27g. It is so light that you can't even feel its weight while driving. The ideal bottle holder for your bicycle. What's mor, the