Celestron Binocular Tripod Adapter allows you to mount your binocular to both roof prism and porro-prism models to a tripod for added stability and convenience. Also allows for hands free for other tasks and vibration-free viewing. The "L" shaped bracket attaches to the center hinge of most binoculars. This adapter mounts to 1/4" x 20 tripods. Allows you to mount your binocular (porro or roof) to a tripod for added stability and convenience Allows hands free for other tasks Vibration free viewing Strong and durable Very light weight