The BA-185 Binocular Tripod Adapter steadies a binocular for clear, relaxed, hands-free viewing. It works with any roof prism binocular that has a standard 1/4"-20" thread tripod socket and on most models its thin bridge will still allow you to set your binocular to the minimum interpupillary distance adjustment. Screws on to binocular between objective lenses and attaches to any standard tripod, monopod, chest support, etc. (binocular must have a 1/4"-20" threaded socket). Intended for roof prism binoculars (some 50mm+ roof prism binoculars may have an increased minimum interpupillary distance).