The Winco PFHW-C Food Storage Box Cover is designed to fit 18" x 12" food storage containers, providing a secure and reliable seal. Made from BPA-free polypropylene, this durable cover ensures safe food storage while maintaining freshness. Its white color offers a clean and professional appearance, and it is NSF certified for safety and quality. Sold in quantities of six, this cover is an essential addition to your food storage solutions.