Ezi-Guide self-aligning boat loading system simplifies launching or loading your boat safely to the center of your trailer, ensuring strong winds and current or rough water, will no longer be an obstacle. Solo launching and loading. Rust resistant dacroment finish. U-bolt ezimoumt system (no power tools or drilling required). Slotted mounting bracket to suit 1.96 - 2.57" cross beams. 1.96" U-bolts supplied (installation can be performed on location, using a 0.75" socket).