Water Bottle Cage, MaxMall 2-Pack Aluminum Bicycle Water Bottle Cage Light Cycling Alloy Cage Made of Aluminum Alloy, extra strength and durability combined with low weight, Perfect forlong-term using. 4 Mounting Screws Include : The screws are standard size for water bottle mounts and bottle cage fits most water bottle cages. Special design:The 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. 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. Comes with 2-Pack: 2 x Bicycle Water Bottle Cage(4 Mounting Screws),MaxMall provide you 12-month warranty and supply friendly customer service to all of you.