This 230mm desiccator plate is made from a light green ceramic-metal composite and has greater resistance to thermal shock than porcelain. Fire-polished corrosion-resistant inert non-stick glass surface is bonded to metal. The plate is marked with numbered quadrants for easy location of crucibles and other containers. Plate has 24 holes; center hole measures 7/8 inches. Autoclavable. Material: light green ceramic-metal composite. O.D.: 230mm (9-1/16 inches). Size: 230mm. Nalgene #: 5312-0230.