New Material: New upgraded aluminum alloy bicycle bottle holder, PC material bayonet, oxidation treatment, not afraid of rust, , the distance between the hole distance of the road bike bottle holder is 6.5cm-6.7cm(2.55inch-2.63inch) Compatibility: The bike water bottle cage can be adjusted at the opening. It has four support points and can be firmly stuck. It is suitable for sports water bottles of sizes. The smooth PC material bayonet will not scratch the bottle With Bottle Holder Adapter: This bike bottle holder with a bottle holder adapter. The double-layer screw lock design is more stable and difficult to slide. It is used for bicycles without a bottle holder hole. The diameter of the bottle holder adapter is 1.8cm-3.5cm Easy to Install: With a screwdriver and screws (included inside the product), you can be quickly and easily installed on the bicycle within 60 seconds where you want it and : The weight of the bicycle water bottle holder(including the adapter) is only 150g, which will not affect your pursuit of speed. Mountain bicycle bottle holder cage is Perfect for road, mountain and kids bicycles size:14 x 6.5cm Material:Aluminum alloy colour:black Package Contents: 1 x Bike Bottle Holder 1 x wrench 2 x screw Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.