Our Stainless Steel Cookie Sheet is substantially designed with multiple layers that conduct heat evenly and efficiently. It’s made with 5-Ply construction and has a T-304 surgical stainless steel baking surface. No other bakeware cooks so evenly! Our Large Cookie Sheet is also covered by a Lifetime Warranty. The 17.5" x 14.22” area will accommodate lots of small cookies or some monster cookies! It’s also perfect for warming up frozen hors d’oeuvres for your next trouble-free get-together! Product Features: Diameter Rim to Rim: 17.5" x 14.22" Inside Cooking Diameter: 16.53" x 12.49" Oven Safe Up To 500 Degrees Cladded Metal .07 Gauge T-304 Surgical Grade Stainless Steel Handcrafted in the U.S.A This Item Includes: Large Cookie Sheet and Certificate of Authenticity.