This MetroMax Q open‐grid shelf is 18" x 42" and is super easy to install and easy to clean. The open grid shelves promote air circulation and light penetration. The shelf mats are protected with the Microban. Antimicrobial properties are built in to inhibit the growth of bacteria that may affect this product. The antimicrobial properties do not protect users or others against bacteria, viruses, germs, or other disease organisms. Always clean and wash this product thoroughly before and after each use.