Orion 5271 Versatile Tripod Mounting Adapter for Binoculars Versatile aluminum adapter allows attachment of either porro-prism or roof-prism binoculars to a tripod Holds binoculars of 80mm or smaller aperture on a tripod or binocular mount for long viewing sessions Threaded adapter 1/4"-20 socket fits standard photographic and field tripod heads Adapter height is 4