This 2-piece set of universal pot lids is specially designed to fit most cookware with a diameter ranging from 7 in. to 12 in. Whether it's a flat pan, frying pan, stew pot, stock pot, or wok, you can easily cover them with just these 2 lids. It's a must - have cookware in your kitchen, enabling you to bid farewell to a messy kitchen and keep it tidy and organized.The pot lids are made of high quality tempered glass and food grade silicone. Tempered glass is safer and stronger than ordinary glass and has no risk of metal rusting. The silicone outer ring and the anti-slip knob are heat resistant up to 450°F, ensuring safe use.The transparent glass design allows you to directly monitor the cooking progress without removing the lid. The unique steam vent hole design can release excess moisture and pressure, prevent spillover, and minimize moisture loss at the same time.Cleaning and storage are equally convenient. The lids can be directly placed in the dishwasher, saving your cleaning time, and they can also be easily rinsed under running water. Their flat design takes up less space when stored, saving more space in your kitchen cabinets.