Function: Boat trailer roller can ensure the safe transportation of boats, protect the hull, improve loading and unloading efficiency, etc Features: The bracket can adjust the height as needed through the mounting slot, and the flexibility allows the roller bracket to better fit the hull and provide more effective support Premium Material: Boat trailer roller is made of quality steel and quality rubber, which is wear resistant, not easy to damage, and can be used for a long time Easy To Install: Boat trailer roller can be quickly installed and disassembled, saving time and labor costs Scope of Application: Boat trailer roller is suitable for yachts, kayaks, fishing boats, commercial ships, etc Specification: Material: Steel Rubber Product Size: 20.5 cm/8.07 inch Package Includes: 1 Yacht trailer bracket 2 Screws 4 Gaskets 2 Nuts Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.