CE Smith 75" I Beam Mount Post Trailer Guide-Ons 27635These 75" extra tall I Beam mount Post Guide-Ons allow you to see the location of your trailer when it's under water. Designed for I-beam trailers and I-beam boat lifts, these guide-ons feature an innovative two-piece mounting clamp that works above or below the I-beam. Brackets will fit onto any height and virtually any width I-beam trailer frame. 75" Extra Tall Guides are great for larger boats with high freeboard or longer boats that where trailer is deeper in the water. Mounting hardware included; Sold in pairs; Adjusts out to 19" each side; 1-1/2" square. 16 gauge pre-galvanized steel uprights; 2-3/8" diameter white PVC posts.; Fits up to 4" wide I-Beam; 75" Height for better visibility; Pre-galvanized steel parts are stamped from a sheet of steel after it has already been galvanized. The galvanized coating is very thin (0.45 oz. on each side); ** Picture not of the IBEAM Mount but does display post style guide on.