DURABLE MATERIAL: The bike water bottle cage made of High-strength aluminum alloy is gifted with outstanding durable performance and it can hold varieties of terrible use scenes without changing its shape since the adoption of the material also gifted it with good wear-resistance and Corrosion resistance 2.ADJUSTABLE & STABLE: The reserved space of the notch on the bottom of the bike water bottle holder makes the screw adjustable, which results that the water bottle cage being suitable for most types of bikes. The cages can also be fixed on the bike with the cooperation of the adjustable screw and the other fixed screw and this can make it more stable than other cages EASY TO INSTALL: The screws also make the bike water bottle cage easy to install since it doesn’t have to be installed with many tools but only one No. 3 hex wrench(INCLUDED). Without many steps to fix it on the bike frame or under the saddle, you just need to spin the screws a few times with the hex wrench, and the bottle holder could be installed completely UNIVERSAL FITS: The reserved space of the notch on the bike water bottle cage for one adjustable screw and the other for a fixed screw makes it fit most types of bikes, and the adoption of aluminum alloy can make it extensible so that the holder is suitable to vary sizes of bottles while ensuring the durable performance STAY HYDRATED ON RIDE: The bike water bottle cage can be installed on the top frame and under the saddle so that it’s Easy to access your bike water bottle when you are thirsty for water, which can support you in cycling for a longer time Manufacturer ?ROCKBROS Brand ?ROCKBROS Model ?water bottle cage Item Weight ?4.4 ounces Product Dimensions ?2.87 x 3.94 x 5.63 inches Item model number ?31210001*2