C.E. Smith Angled PVC Post Guide-Ons - Visual markers when backing trailers down the ramp. Easily center your boat on your trailer when loading. Features: Fits frames up to 3in wide by 4-1/4in tall Metal uprights allow for 13in of side adjustment Uprights have 15 deg of angle away from your boat's edge 1-1/2in square 16 ga pre-galvanized steel uprights Can be mounted above or below the trailer frame 2-3/8in outer diameter black PVC tube Reflective caps offer enhanced visibility All mounting hardware included Sold as a pair