Made of high quality cold rolled steel, baking finish. Smooth surface, rustproof. 90 degree elbow, hidden weld seam. It may look slim and simple, but it has a strong triangular structure that provides plenty of load capacity. Our test proves that after putting a shelf on it, making it evenly stressed, each pair of brackets can hold up to 30 kg, about 29.9 kg (mounted on a concrete wall). Dimensions: Thickness: 2 mm, Width: 16 mm, Side Length: 95 mm x 150 mm, 120 mm x 200 mm, 160 mm x 250 mm. Easy to Install: It comes with all the hardware you need, 2 long silver screws and 2 white plastic anchors for mounting, 2 or 3 short silver screws for each bracket. Perfect choice for space saving, home decoration. Practical and inexpensive. If you have any problem with the product like missing components, damaged, wrong size, etc., please contact us.