An excellent aid in steadiness while photographing or videoing. Fits over shoulder, braces against chest and back, holds camera at eye level.  Helps eliminate bouncing effect common without a camera support.  Makes panning left and right more stable.  Performs same function for better still photography as well, especially Birding.  Holds most cameras that have standard thread-mount on bottom.  Locks down tight with metal screw on attached rubber padded mount.  Well made of strong pro-level grade composite material.  Has attached strap for ease of carry.  Folds down compactly for easy storing or traveling.  Please see my photos of actual item.  (camera shown, Nikon D7200 with 300mm f4.0 telephoto lens, is demo-only, not included)