Stud fits most popular binoculars 1/4-20 threads on the market Vortex Swarovski Zeiss Nikon Stud only, this works with the Bino Binocular Tripod Adapter extra Stud is best used when you have 2 or more pairs of binoculars and want to change between them fast 10x42 and a pair of 18x56 no problem with the extra stud to fit on your Muntnt Tripod Adapter The Box 1 tripod adapter stud, material: nitrated steel, .61oz, Length 1.18in, width .78in，Detachable Universal Mount Accessories with 1/4-20 Inch Threading The top attachment screw is only 1.18 inches, secure and won't dig into your chest. The adapter features a new design that allows for quick release by loosening the knob, pressing a small button on the front and then pulling the binoculars straight back to activate the knob. To replace binoculars, simply plug the QR post back into the tripod adapter