3mm Galvanized Iron - Support 90lbsShelf brackets are made of galvanized iron, which is stronger to support heavy-duty than other materials, a pair of triangular brackets can support a maximum weight of 90lbs. The surface is treated with high-temperature black baking paint, the anti-rust and anti-corrosion design makes the floating shelf bracket more durableProduct Dimensions & Package ContainsDimensions: L 5.5" x W 5" x H 0.78", 3mm Thick. (These brackets are suitable for the size of wood shelf boards: width 5.5"8", thickness 0.78"1".) Package contains: 4 x Black shelf brackets, 13 x Long Screws, 13 x Plastic wall anchors, 9 x Short Screws and 1 x Bubble Level. All shelf brackets are individually packed in foam bags to prevent scratches during transportation. (Note: wood shelf is not included)Countersunk Screw Holes Design The bracket has been upgraded with countersunk screw holes from the previous version. The screws will be flush to sub-flush after being installed, so the surface of the bracket is completely flat with no gaps between the shelf bracket and the shelf board after installationTriangular Appearance & Hidden after InstallationThe shape of floating shelf brackets are different from other brackets for shelves. The heavy-duty corner brace is only 0.75 inches high so you can easily conceal them between the wall and the shelf. And the triangular design increases the modern fashion sense of your room, can also save you lots of space, and make your house look neat and cleanEasy Install & Widely-usedInstallation method: 1. Use a drill to dig holes in the wall and wood plank 2. Install the screw to fix the anchor 3. Tighten the screw with a screwdriver. A beautiful decorative shelf bracket is installed, no special skills are required to mount these brackets. You can widely use it in the living room, bedroom, kitchen, bathroom, yard, garage, tool room, etc