Vktech Cycling Bike Bicycle Motorcycle Water Bottle Holder Rack Aluminum Alloy Equipped with a mounting bracket, easy to install Material:Aluminum alloy Suitable for all kinds of drinking bottles (upside down) Caliber:2.1cm, fit for almost handlebar (diameter:2cm-2.5cm) Cupholder size:Approx. 8.5x6.5x14cm(LxWxH)