1.ROBUST and DURABLE-Back Plate with radius for assembly flat surface or to Curve/ round tube dia. 7/8' to 1' (25-32 mm); Sold in a pair, fasteners not included, recommend 6 #12 x 2-1/2' Marine Grade Stainless Steel Phillips head screws for result while mount into wood studs. Spec: Bracket Long Arm = 12', Short Arm = 6.5'; Max. 550 lb. load rating per pair when fastened to 2 x 4 studs on 16' centers (weight force load on 16' x 12' board). 2.HIGH QUALITY--Made of durable marine grade 304 stainless steel, shelf bracket is corrosion resistant, rust-proof and ability to anti-acid to withstand long time usage. Support Beam Steel thickness gauge #9 (4mm). SeaLux Folding Brackets use copper washers and 3mm thick plastic washer bushings for long last usage. 3.Widely Application - These folding brackets were originally designed for Marine Boat folding seats, tables and other application purposes. They are ideal for many do-it-yourself jobs around the house. Folding working table in garage, Folding table for grill, and widely used on caravan, and perfect for space saving projects. Use to make a collapsible table for your room; Install a folding counter in your BBQ trailer; Remember, this type of bracket bears much more weight capacity. 4.Space Saving: The hinges lock at 90 degree angle. When you want to collapse the table simply press the release handle to fold away. Excellent performance suitable for limited spaces when you want a work surface that can be folded down and out of the way. Helps keep your limited space maximize its function.