When looking for the best, get something Sturdy Built. Ideal for saltwater or freshwater use, this galvanized kit contains everything you need to mount your bunk boards (not included). These bunk brackets mount with the flat surface facing your boat trailers cross braces. The galvanized u bolt wraps around the brace, and the washers and nut secure the bracket in place. The slotted holes in the bunk support allow for height adjustment. Includes: swivel top brackets, slotted bunk brackets, zinc plated bunk bracket bolts, galvanized mounting U-bolts for the brackets and galvanized lag screws to secure boat trailer bunk boards.