Aluminum Alloy Bicycle Water Bottle Cage Holder Mount Adapter Bicycle Seatpost Adapter Bottle Bracket Cycling Accessories for 21‑31.8mm/0.8‑1.3in Handlebars ★ Made of aluminum alloy, it has smooth surface, corrosion resistance, high strength, sturdiness and durability, and prevents deformation and damage. ★ Multifunctional adapter, with two water bottle holders, can carry gas cylinders or two water bottle cages. ★ The bracket can be rotated 360 degrees to fit the installation position, easy to install and remove. ★ Commonly used for seat tube, bend handlebar, straight handlebar, can be directly locked on the seat post to hang two bottle cages. ★ Suitable for handlebars with a diameter of 21‑31.8mm/0.8‑1.3in, suitable for various types of bicycles, including mountain bikes, road bikes and folding bikes. Specification: Item Type: Dual Bottle Cage Mount Adapter Material: Aluminium Alloy Product Color: As Pictures Shown Product Size: Approx. 78x82mm / 3.1x3.2in Double Bracket Spacing: Approx. 50mm / 2.0in Product Weight: Approx. 105g / 3.7oz Applicable: For 21-31.8mm / 0.8-1.3in pipe diameter Rotable: 360 degree rotation Package List: 1 x Bottle Cage Mount Adapter 2 x Bottle Cage Holder 4 x Mounting Screw 1 x Gasket 1 x Hex Wrench