The Half Bottle Adapter allows you to move the position of the bottle basket to make the bottle more accessible and to accommodate other accessories such as a pump or tools. Allows easy access to bottles and out of reach of feet. Supplied without B-RAD base. easy installation using existing bike basket mounts (B-RAD Base component required; sold separately). For frames with a curved down tube, use the DogBone base. Great for trails, enduro, pack bikes, XC and city/work cycling.compatible with any bike frame that has 2 standard 64mm bottle basket mounts (most modern frames). Material: 6061-T6 aluminum brackets Weight: 18g Maximum load: 1700g Tools Needed: T25 Torx Torque: 3-4 Nm Made in the USA