FiveBox Lightweight Aluminum Alloy Bicycle Water Bottle Cage Holder for Outdoor Activities High quality:Made of Aluminum Alloy, extra strength and durability combined with low weight. Two Screws Include : The screws are standard size for water bottle mounts and bottle cage fits most water bottles. The water bottle cage has arms that wrap around the bottle for a secure and firm hold so you don't have to worry about it falling out during your ride. Light and durable design:can effectively reduce the weight for long-distance travelers, ideal for usage by cycling,race car. Easy installation : Use a 4mm hex key (Not included) to fasten cages in screw holes on frame. Please Note - bike frame requires threaded holes for installation of cages.