Durasafe Universal Electronics Gimbal Bracket Lock. Durasafe UEL50... Universal design fits most popular GPS fish finder, chartplotter and VHP brands. Replaces a factory knob and secures your unit to the bracket. Protects property and deters theft; Inexpensive insurance for you! Simple, compact and easy to install; Rubber cap to protect from elements; Eliminates the hassle of uninstalling and reinstating equipment; Reduces wear and tear on plugs and wires; Proudly made in the U.S.A. Downloadable fit chart and installation instructions located on website. You can order yours today! Durasafe Universal Electronics Gimbal Bracket Mount