It are designed to securely fit crucibles with a 70mm diameter, providing an essential tool for high-temperature applications in laboratory environments. Made from durable porcelain, these lids offer excellent heat and chemical resistance, making them ideal for use in heating, calcining, or melting experiments. The 74mm diameter ensures a snug fit, helping to prevent spills and maintain sample integrity during processing. This pack of 5 lids is an economical solution for laboratories requiring reliable, high-quality lids for their crucibles.