Boat Guide On Kit - 50' - Pair Boat 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 [https://productimageserver.com/prop65/6pt.png]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 [http://P65Warnings.ca.gov].