Bike Water Bottle Cage, Bicycle Alloy Lightweight Water Bottle Holder (15 YEARS LIMITED WARRANTY), Cycling Aluminum Water Bottle Cages, Water Bottle Brackets for Sports (2 Pack) COMES IN PAIR AND AVAILABLE IN TWO COLORS: This bottle cage is sold as a pair. Two colors are availableblack and silver. LIGHTWEIGHT MATERIAL: This bottle cage is made of 6061-T6 head-treated aluminum plate and plastic. Each bottle cage weighs 1.6 ounces. The high-quality material and manufacturing process reinforce for extra strength. FITS MOST STANDARD SIZED WATER BOTTLES: This economic and basic designed bottle cage fits the bottle diameter around 3 perfectly. This Aluminum and Plastic combination has no welded pieces so it can expand to your water bottle better! EASY INSTALLATION: Use a 4mm hex key (not included) to fasten cages in screw holes on frame. The included 4 X M5 X 12 screws are standard size for water bottle cage mounts. PLEASE NOTE  bicycle frame requires threaded holes for installation of bottle cages. 15 YEARS LIMITED WARRANTY: This product is covered by BikePak warranty. We are so confident you will love this product that we offer 30 days Money Back Guarantee with 15 years warranty!