The Vanguard BA-185 Binocular Tripod Adapter steadies your binocular for clear, relaxed, hands-free viewing without vibration. It works with any binocular that has a standard 1/4"-20 threaded adapter socket, and its thin profile is especially useful with roof prism models as it will allow you to set the binocular to the minimum interpupillary distance without interference. It should be noted that binoculars with 50mm objectives and larger may experience an obstruction. For mounting on tripods, heads, monopods, window mounts, and other support systems the adapter has a standard 1/4"-20 mount.