You can hang all the shelves using hidden floating shelf hardware to make your home decor more simple and beautiful. The invisible shelf bracket can be drilled into wooden boards and walls, suitable for living rooms, offices, bedrooms, kitchens, etc.SpecificationColor: Silver ToneMaterial: Carbon SteelSize: 213mm / 8.39 inch (Length)Wood Hole Depth：150mm / 5.9 inchWall Hole Depth: 63mm / 2.48 inchApplicable Wood Board Width: 120~220mm / 4.72~8.66 inchApplicable Thickness: 15~22mm / 0.59~0.87 inch Installation Spacing: 20~30cm / 7.87~11.81 inchPacking List: 4 x Floating Shelf Bracket (mounting hardware included)AdvantageStrong & Blind - The blind shelf support provides strong and secure support for the floating shelf.