Vanguard BA-185 Binocular Tripod Adaptor Enables you to easily mount your binoculars to a tripod for stable viewing Intended for roof prism binoculars (some 50mm+ roof prism binoculars may have an increased minimum interpupillary distance) Screws on to the binocular between the 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)