C.E. Smith Hot-Dipped Galvanized PVC Post Guide-Ons - Visual markers when backing trailers down the ramp. Easily center your boat on your trailer when loading. Perfect for heavy salt water use. Features: Fits frames up to 4in wide by 5-1/2in tall 90 deg metal uprights allow for 19in of side adjustment 1-1/2in square 11 ga galvanized steel uprights Patent pending upright corner bracket adds increased strength Can be mounted above or below the trailer frame 2-3/8in outer diameter white PVC tube Reflective caps offer enhanced visibility All mounting hardware included Sold as a pair