ITEM NAME:WHeeL UP Aluminium Alloy Bike Cycling Water Bottle Holder Cages Clamp Clip W4W9 WHeeL UP Aluminium Alloy Bike Cycling Water Bottle Holder Cages Clamp Clip W4W9 Features: Constructed by quality Alumimum, sturdy made & long service life;CNC machined, accuracy and smooth cut maintianed; Vertical and horizontal positioning adjustable, Can mount on seat post or handle bar; With stainless steel bolts, weather and use durable. Specification: Rack Material: Aluminium alloy Processing: CNC-machined, anadozed furnishing; Bolt material: Stainless Steel, hex-headed Mount: Handlebar or seatpost Colors: black Application: Fit 30.9mm 31.6mm Tube holder, 31.8mm Swallow,stright handle Weight: Approx. 58 g Package Contents: 1 * Bottle Cage Holder Clip.Rack Material: Aluminium alloy. Application: Fit 30.9mm 31.6mm Tube holder, 31.8mm Swallow,stright handle. With stainless steel bolts, weather and use durable. Bolt material: Stainless Steel, hex-headed.