This is a Billet, Fold-Down, Tab Mount Bracket by Checkers. This is used to mount a Warning Whip.
One of the benefits to using Checkers Warning Whips is having the ability to use their wide variety of mounting options that accommodate almost any need you may have. They also offer a full selection of replacement parts. If there is a Checkers part you need that you don't see on the website, please feel free to contact us. We can order it for you.