Once you have these hidden shelf hardware, you don't have to worry about ugly metal accessories damaging your home decor. It will create an illusion of a floating shelf. Hang any shelves you want as you please. Made of metal, rust proof and non bending, ensuring quality and service life in humid weather. A space saving storage space that keeps your home organized and enhances space flexibility. Widely used as a background wall in homes, kitchens, garages, offices, cafes, restaurants, shops, and more. The opening diameter is 10mm and the depth is 125mm. There is an error of ± 1mm, please drill according to the actual situation. Note: Not applicable to boards with a length less than 140mm (width of two supports), a width less than 130mm, and a height less than 15mm. Product dimensions: 130mm * 70mm * 15mm (length * width * height), thickness: 4mm, distance between two mounting holes: 42mm. Packaging content: 4x bracket, 8x contrete anchor bolt, 8x gypsum board anchor bolt, and 8x screw.