[Adjustable Rail System] The sliding base mechanism allows smooth length adjustments to securely fit most standard planter boxes, eliminating the need for multiple bracket sizes. [Reinforced Construction] Crafted from extra thick iron with reinforced joints, engineered to maintain structural integrity through seasonal temperature changes and outdoor exposure. [Multi-Compatibility] The Anti-rust and Anti-corrosion design planter box brackets can be used both indoors or outdoors. The brackets are affixed individually on the wall or under window or bolted to the railings of a porch or deck and holding all kinds of planter box sturdy. You can easily add elegance to just about any space by planting indoor outdoor plants, flowers, vegetables and so on. [Tool-Free Customization] We includes all mounting hardware in the package (steel screws, wall plugs and wing nut screws). You just need to adjust the base to the length you need without drills or specialized tools,then tighten the wing nuts to securely fix the bracket. [Complete Installation Kit] Includes corrosion-resistant brackets, stainless steel screws, and wall plugs for immediate use on diverse materials.