Boat Guide On Kit - 50 - PairBoat guides help you visually guide your boat onto your trailer. High - strength super gripper mounting brackets attach firmly above and below the trailer frame. Easy bolt-on mounting fits trailer frames up to 3 x 5 high. Adjustable to provide optimum fit to any hull design.WARNING: This product can expose you to chemicals including BISPHENOL A (BPA) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.