Tie Down Fixed Angle Roller Guide-Ons These 13-inch rubber rollers can be easily mounted on top or beneath the frame, allowing you to achieve accurate positioning for your boat during loading and unloading. Our galvanized guide mount offers exceptional adjustability, accommodating widths of up to 13 inches on each side and fitting frames ranging from 2 to 4 inches high. This versatility ensures a perfect fit for various boat trailer setups, making them the ideal choice for boat owners of all kin