This adapter allows you to mount your binocular  to a tripod, for added stability and convenience. Many people will find difficulty holding binoculars with 10X or more magnification, so this adapter gives you the option of keeping your heavier optics steady on target, while you enjoy the view. This adapter will fit for most standard binoculars. For those wanting a more robust tripod adapter, Celestron also has the RSR Binocular Tripod Adapter.