Constructed from aluminum alloy with a galvanized coating to in freshwater or marine environments, the adjustable trailer hardware includes a swiveling 8 inch top that conforms to hull and fits 1.5 " ", 2 " ", and 3 " " crossbars for versatile compatibility Perfect for use in securing boats during transportation on trailers or while in storage docks, providing adjustable height and angles to adapt to various hull shapes in wet environments This heavy duty boat trailer crossbars set ensures secure transportation with reinforced welds that resist bending under heavy loads, keeping your boat firmly supported during towing or storage, featuring galvanized boat bunk protections for rust resistance The complete 4 piece boat trailer set comes with brackets, U bolts, nut, washers, and screws for straightforward installation, allowing quick adjustments and ensuring long term durability through simple checks and regular inspections Ideal for boat owners, trailer enthusiasts, and marine professional seeking resistant components for upgrading or replacing trailer parts with minimal maintenance requirements, Manufacturer: Kaeltsyn