Plates include 30mm diameter perforations. Also includes large hole in center. Glazed on one side. Additional Info: Dessicator Plate, 230mm Package Size(L x W x H): 1.4 X 9.8 X 9.8 (IN) Categories: Desiccators, Desiccator Plates HTS Code: 6909.11.4000 UNSPSC: 4.1123e+007 Country Of Origin: INDIA