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 bincular to the minimum interpupillary distance adjustment.Specifications and Features: Screws on to binocular between objective lenses (binocular must have a 1/4"-20 threaded socket) Attaches to any standard tripod, monopod, chest support, etc. (support mechanism must have a 1/4"-20 threaded screw) Intended for roof prism binoculars (some 50mm+ roof prism binoculars may have an increased minimum interpupillary distance)