Modular Anti-Sag Shelf Support System

DIYers frequently build shelves with long spans (e.g., 78 inches here) and specific materials, often unsure about the structural integrity and the need for additional support to prevent sagging under a target weight. A modular, aesthetically pleasing, and easy-to-install physical support system would address this. It could consist of discrete, strong supports (e.g., thin steel rods, hidden brackets) that can be added to the middle of long shelves without requiring complex calculations or professional consultation. This product would provide peace of mind and structural reliability for home builders.