SUPOW Bike Two Water Bottle Cage Mount - Aluminum Alloy - Double Kettle Holder Bicycle Saddle Equipment LIGHT AS A PAPER, STRONG AS AN BULL: It only weights 2.4 oz. Made of SOLID HEAT-TREATED ALUMINIUM ALLOY TUBING. High quality material and manufacturing process for extra strength. Even if after strong impact, it won't distort and fracture. FITS MOST STANDARD SIZED WATER BOTTLES CAGE: Suitable for varied types of bikes, including mountain bike and folding bike. Can be attached to almost of seatpost or tube. Hurry up! Pick up this new equipment for your beloved bike! VERY EASY TO INSTALL: Coming with 6 screws, installed in the backseat, extend installation of two water bottle cages, fits for long time riding or Long distance travel. Never worry about no water in halfway. SMALL SIZE CAN MAKE BIG USE: 4.33 x 5.91 x 2.56 Inches (L x W x H). Don't need to put heavy water into the backpack. SUPOW double water bottle cage mount help to FREE UP your shoulders! WARRANTY: If You're Not Completely Satisfied with Your Purchase, Simply Let us Know and You'll be Offered a FULL Refund or Replacement, No Questions Asked. You can order with confidence!