Holds large conical and round-bottom centrifuge tubes that cannot stand up by themselves (such as Falcon®, Corning®, Nunc®, and Kimble®).Epoxy-coated steel wire rack is 10.2 cm (4") high; has two levels of square grids to hold 6 tubes up to 250 mL (60 mm diameter)Heat-cured epoxy coating is unaffected by organic solvents, salts, weak acids and weak alkalisTemperature range: -223 °C (-369 °F) to 121 °C (250 °F); autoclavable