Roller Pontoon Guide-On. Ideal for bunk style pontoon boat trailer with box, channel, or I-beam frames up to 3" wide x 4-1/4" tall. Minimum friction rolling action easily guide pontoon boat onto trailer. Height is 25" above trailer frame. Mount with roller bunks 2-3" from pontoons on a trailer fram cross member.. Features:. Fits frames up to 3" wide x 4-1/4" tall. U-bolt mounting brackets. Includes two rubber roller bunks. Galvanized steel construction. Zinc plated hardware. For larger trailer frames check out the Large Frame U-Bolt Kit (11416).WARNING: 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 P65