The Wolf Tooth B-RAD Double Bottle Adapter is part of the B-RAD™ system that allows you to fit 2 bottle cages side-by-side. This allows for easy access to bottles, out of the way of your legs.  Wolf Tooth B-RAD Double Bottle Adapter Features Easy to install using existing cage mounts on a bike B-RAD Base component is required; sold separately Requires use of a B-RAD mounting base Compatible with any bike frame that has 2 standard 64mm spacing bottle cage mounts (most modern frames) Wolf Tooth B-RAD Double Bottle Adapter Specifications Material:  6061-T6 aluminum brackets Weight:   20g Maximum load:  1700g Torque: 3-4 Nm Made in the USA