Bunk Board Pontoon Guide-OnIdeal for bunk style pontoon boat trailer with box, channel, or I-beam frames up to 3" wide x 4-1/4" tall. Pontoon glides easily past the carpeted bunk boards guiding the pontoon boat onto the trailer. Height is adjustable and is set during install between 24" and 36" above trailer frame. Mount with bunks 2-3" from pontoons on a trailer fram cross member. Fits frames up to 3" wide x 4-1/4" tallU-bolt mounting bracketsIncludes two 24" carpeted bunk boardsGalvanized steel constructionZinc plated hardwareFor larger trailer frames check out our 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 P65Warnings.ca.gov.