Sturdy & Heavy Duty The folding shelf brackets are made of premium polished Steel with surface brushed treatment to resist daily scratches, corrosion and tarnishing, allowing it to remain looking best. It is not as easy to rust as paint bracket, and it will not cause harm to human health. Triangle shape is the sturdiest construction in wall brackets. Space Saving The folding brackets can lock at 90 degrees. When you want to fold the table, simply press the relaxation arm. Excellent performance, suitable for narrow spaces, if you need a worktop that can be folded down and to the side. Helps to keep your room in order.