60 Post Guide-On w/I-Beam Mounting KitProduct DescriptionThese 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. Features:Mounting hardware includedSold in pairsAdjusts out to 19 each side1-1/2 square. 16 gauge pre-galvanized steel uprights 2-3/8 diameter white PVC postsWARNING: This product can expose you to chemicals including LEAD,Chromium (hexavalent compounds) which are known to the State of California to cause cancer, birth defects or other reproductive harm, and NICKEL (METALLIC),COBALT METAL POWDER,BERYLLIUM which are known to the State of California to cause cancer, and ARSENIC ,CADMIUM which are known to the State of California to cause cancer or other reproductive harm. For more information go to P65Warnings.ca.gov.