Vanguard VEO BA-185 ARCA Binocular Mount for Tripods/MonopodsThe VEO BA 185 ARCA binocular tripod adapter fits onto any tripod quick release plate or directly into the clamp of an Arca compatible tripod head. This adapter helps to steady your binoculars for clear, relaxed, hands free viewing. It works with any roof prism binocular that has a standard 1 4" thread tripod socket, and on most models, its thin bridge allows you to set your binoculars to the minimum interpupillary distance.