A Handy, Little, Space Saver, This Circular Twelve Place Polypropylene Test Tube Stand Has Four 25 Mm Dia Holes & Eight 19Mm Dia Holes In Its Top Plate. The Base Has Matching Hemispherical Wells & 16 Vertical Pins For Drying Tubes Surrounded By A Trough To Catch Drippings. This Autoclaveable Rack Can Be Easily Disassembled For Cleaning