- High quality stainless steel construction: cookie sheet and cooling racks are made of pure stainless steel, with no aluminum contact or harmful substances. A healthy replacement for toxic coated bakeware, rust resistant and durable for long service life. - Adjustable multi-layer design: the rack feet swing over 90 degrees and can be stacked stably on another rack to create a multi-layer baking rack. Provides higher and larger space to cool and bake more food at once. Collapsible design fits large sheet pans and allows easy storage. - Large sheet pan performance: solid stainless steel construction, extra heavy-duty to resist deformation, and no toxic coating that could flake into food. Spreads heat quickly and evenly, with a 1 inch deep rim all around to hold more food and prevent sauces from flowing. - Craft and finish: rack wires are welded firmly to steadily support food. Dense parallel wires prevent food from slipping through. Smooth roll edges make the sheet comfortable to hold and transfer. Mirror finish stays shiny and easy to release food. Easy to clean by hand and dishwasher safe. - Practical use scenarios: - Bake cookies on one level while cooling cookies on another level to maximize oven and rack space during busy cookie-baking days. - Roast vegetables or small poultry on multiple tiers for efficient meal prep without crowding. - Bake and cool multiple sheet pans for batch cooking or holiday baking, then collapse for compact storage when not in use.