Feature: 1. Versatile Compatibility: Suitable for 3in x 3in, 2in x 3in, and 1.5in x 3in trailer crossbeams, this bracket kit is compatible with various sizes of boat trailer crossbeams, offering flexibility in installation. 2. Adjustable Swivel Top Design: The adjustable swivel top bolster support allows you to align the angle to contour to the boat's hull, whether angled or flat, reliable performance. 3. Secure Installation: U Bolts with a 3.1in extended thread design provides a secure and reliable mounting solution. The galvanized u bolt wraps around the brace, and the washers and nut secure the bracket in place. 4. Galvanized Surface: Constructed from heavy duty metal materials with a galvanized surface, the bunk bracket kit is resistant to rust, ensuring long lasting durability and preventing bending or deformation. 5. Concave Design for Stability: Boat trailer bunk brackets mounted to cross members in front and behind the axle or mounted to cross members that are c channel in shape, features a concave design to prevent rotation. Specification: Item Type: Swivel Top Bunk Bracket Kit Material: Metal Characteristic: The slot holes on the bed bracket can be adjusted for height U Bolt Size: 1/2in diameter, 3in wide, 4.5in long; 3.1in extended thread Applicable: Suitable for 3in x 3in, 2in x 3in, and 1.5in x 3in boat trailer crossbeams. Package List: 4 x Swivel Top Brackets4 x Slotted Double Layer Brackets4 x U Shaped Bolts12 x Screws12 x Nuts24 x Gaskets