This Manfrotto 088LBP Adapter is a 1/4"-20 to 3/8" adapter, with flange. It is also known as a reducing bushing; it is for use with light stands or tripods that have a top screw of 1/4"-20, or when the camera or lighting fixture to be used only has a 3/8"(Euro) threaded receptor. This item replaces old catalog #3367.