These 4.8 mm thick plates are able to withstand temperatures up to 150°C (300°F) and have excellent resistance to thermal shock, and to chemicals. They are non-combustible and asbestos free. Round plates are perforated with 4 mm (.165") diameter holes on 12.7 mm (½") centers in a straight line pattern. They are available in three sizes, and fit our following desiccators 71230; 71232; and 71234.