The patent-pending Hitch Mount Sign Holder SA-43921 transforms standard vehicle hitches into sign holders. sign holder fits into any 2” square hitch receiver and holds a 36" or 48" MDI Compact sign (sold separately). It is specially designed so sign can be rotated 45 degrees in either direction for optimum viewing. Two-position telescoping upright is equipped with detent button for easy adjustments. Ideal for rolling crews.