This 12 in. glass cookware lid is made from high-density tempered glass that remains clear and crack-resistant under thermal stress. It features a widened stainless steel rim for structural integrity and a precisely engineered steam vent crafted from food-grade SS304 stainless steel to regulate pressure and prevent boil-overs. The heat-resistant silicone knob stays cool to the touch up to 450°F and provides a secure, non-slip grip. Designed for universal compatibility, it fits most standard 12 in. diameter pans, pots, cast iron skillets, woks, and saucepans. The lid seals effectively without warping and maintains consistent heat retention during stovetop or oven use. Its smooth surface and seamless rim construction resist staining and simplify wiping or dishwasher cleaning. No adhesives or coatings are used—only pure tempered glass, stainless steel, and FDA-compliant silicone. It supports both visual monitoring and moisture control without needing to lift the lid frequently. The balanced weight distribution ensures stability when placed on uneven cookware surfaces. This lid functions equally well for simmering, steaming, braising, or baking applications where controlled evaporation matters.