【Sturdy and Durable】This window planter box bracket is made of high-quality thick iron material with a black powder-coated surface, sturdy and durable, and can hold up to 40 pounds. 【Adjustable Base Design】The base of this flower box brackets comes with a slider bracket assembly that allows you to adjust the length of the base rails to fit a variety of pots with a minimum depth (front to back) of 7.09 inches and a maximum depth of 9.06 inches. 【Easy Installation】This planter box bracket is easy to install, all you need to do is adjust the base to your desired length and tighten the wing nut to hold it firmly in place. 【What You Get】You will get the adjustable planter box bracket and all mounting accessories (steel screws, wall plugs, and wing nut screws). 【Widely Used】This window box bracket is designed to be rustproof and can be used indoors or outdoors. It can be individually fastened to a wall or under a window, or bolted to the railing of a porch or deck, and can securely hold a variety of planters. You can grow indoor and outdoor plants, flowers, vegetables, etc. in any space, easily adding elegance to your space.