Description Are you looking for a professional, yet reasonable bike bottle cage adapter? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no further! Our Seatpost Bottle Mount Holder Adapter must meet your needs, this bike bottle cage adapter is one of the best choices for you. Features -Color:Black -Material:Aluminum alloy -Size:7.80X5.50X2.50cm/3.07X2.16X0.98in diameter: 19-33mm - Made with premium aluminum alloy, smooth surface, anti-rust and durable. - The adjustable bike bottle cage adapter keeps your bike's drink cage in place so you can ride harder and longer without worrying about your bottle cage breaking down after a big bump or long distance ride. - The bike seat post adapter is secured with double screws for a firm and secure grip. - The bike bottle cage adapter is compatible with almost most bikes and bottle mounts. - Simple , but very practical in use, which brings great convenience to you. Made with premium aluminum alloy, smooth surface, anti-rust and durable. The adjustable bike bottle cage adapter keeps your bike's drink cage in place so you can ride harder and longer without worrying about your bottle cage breaking down after a big bump or long distance ride. The bike seat post adapter is secured with double screws for a firm and secure grip. The bike bottle cage adapter is compatible with almost most bikes and bottle mounts. Simple , but very practical in use, which brings great convenience to you.