Thick lids are designed to ensure top performance and temperature retention. Nylex Latches eliminate sharp edges; won't rust, bend, or dent. Accommodates all third, half, and full size food pans. Exclusive automatic venting system eliminates unsanitary vent openings and easily lost vent caps. Uses combination, 4 x 4 or 6 x 2-1/2 Rubbermaid Cold Storage Pans.