Check the listing for details. Vortex Pro Binocular Adapter Stud (TRA-BINSTUD). Condition: New. Listed at 19.99 USD. Vortex Pro Binocular Adapter Stud (TRA-BINSTUD) If you like to use different size binoculars, but only one tripod, pick up the Vortex Optics Pro Binocular Tripod Adapter and one or more of their Pro Binocular Adapter Studs and you won't have to move the whole adapter from one chassis to another. The stud is one part of the tripod adapter's 2-part system, so you can have the base portion on your QR plate and leave a stud in each set of your binoculars to quickly change your kit depending on what you're glassing and where you're going to do it. It has a standard 1/4"-20 mounting screw for your binoculars' adapter socket on the front of its bridge hinge. Binocular Mounting: ¼”-20 male