Premium Material:These kitchen pot lid knobs are made of premium bakelite material, which is non-toxic, heat-resistant and wear-resistant, sturdy and durable. Easy to install:Screws are easy to fix, just put the cover button, rubber gasket and metal gasket correctly, then tighten with the screw. Design Ergonomics:Unique ergonomic design makes it easy and comfortable to grip, which can prevent hot lids from burning your hands. After use, simply clean it with a damp cloth. Wide Applications:Universal pot lid knobs are suitable for many kinds of kitchen utensil lids, such as kettle, oil pot , frying pan, pot lid, pot lid, frying pan lid, etc. Package includes:You will receive 4 pot lid knobs with mounting screws(other products do not are not included), suitable between 5 mm/0.2 inch to 11 mm/0.43 inch mounting hole of the covers.