Polypropylene thermometer rack holds up to 25 thermometers in a vertical position Hole diameters in top and middle plates are 7.9 mm ( 5/16") Bottom plate has 3.2 mm ( 1/8”) diameter drain holes. Overall dimensions: 149 x 213 x 251 mm (5 7/8 x 8 3/8 x 9 7/8”)