[High Quality Material] The boiler cover knob is made of Bakelite, which is a healthy flame retardant and heat resistant material. The screws are stainless steel and do not rust. High quality materials are durable and greatly improve the service life of the pot handle cover, the base is solid and stable. [Easy to use and clean] Our potty handle is easy to install with fixing screws for easy fixing, just put the right knob, rubber washer and metal washer, then tighten. These universal pan handles are easy to clean with a damp cloth and our lid knob is dishwasher safe to replace an old or damaged dial. [Ergonomic Knob] This universal pot handle with screws is an ergonomic knob with a smooth and thick rim without burrs that won't cut your hand sharply and will hold it comfortably. The slightly rounded design of the boiler lid knob facilitates movement. Sleek and simple design can give efficient functionality to your kitchen. [dimensions] handle diameter 4.6cm, base 6.4cm; As long as there is a 5 - 10mm small hole in the middle of the boiler lid is suitable [Full match Design] This is a replacement lid with a useful and safe large handle, you can easily grab the lid and the plastic handle can prevent hand injury. The material is thick, easy to grip and comfortable in the hand, making it an important choice for your family life. The beautiful black and round shapes are suitable for all styles of pans and kitchens. [application] pot lid the pot lid knob is suitable for many kinds of pot lids, such as pots, oil pans, frying pans, pot lids, pot lids, lids glass pan, etc. Set of 4 slow cooker knobs to meet your needs.