This aluminum and stainless-steel swivel top heavy duty bunk bracket. This kit is made up of all aluminum parts with stainless steel hardware. It is the LAST bunk bracket you will ever need. From top to bottom you are outfitted with anti-corrosive parts that will last a lifetime. This is for 1 complete bracket, normally there are four or more on a standard trailer, and are designed to mount to a 3x3 crossmember only. This product can be used for your main bunk assemblies but are also frequently used with forward bunks to support the bow of the boat, especially on larger trailers. It comes with all the necessary mounting hardware including stainless lag bolts to mount your bunks. These brackets are most commonly used with 2x4 or 2x6 wooden bunks. (not included) These are a very common replacement for the standard swivel top bunk brackets you find on many trailers, just better materials. The swivel top feature allows you to adjust the angle of the bunk to meet the correct contour of your boats hull. The 2x2 piece of tubing is held in place by the hat bracket with pressure from the u-bolts. The hat bracket is shallower than the tubing which allows it to squeeze it to your crossmember. This is a solid aluminum 2" hat bracket drilled to accommodate two 3" u-bolts for 3" tall crossmembers only. Specifications: - Fits 3x3 Crossmembers - Heavy Duty Corrosion Free Materials (Aluminum Stainless Steel) - 10" Tall Aluminum Tubing - 2x2" Aluminum Tubing Includes: - (2) Heavy Duty Aluminum Swivel Top Brackets - (1) Heavy Duty 10" 2x2x1/4" Aluminum Tubing (pre-drilled) - (1) Heavy Duty Aluminum Hat Brackets - (2) Stainless Steel 1/2x3x4 5/16" U-bolts - (1) Stainless Steel 1/2x3 1/2" Bolt - (4) Stainless Steel Lag Bolts to mount your bunks