This two-piece rack is designed for long life and heavy usage. Larger volume benchtop processing of up to fifty 1.5 ml tubes (or other tubes with a diameter less than 12 mm) can be accommodated with one of these racks. The tray is deep to hold more ice and water and to extend use time. A flat perimeter rim provides space for labeling tape. Racks can be safely stacked with identical racks when loaded or empty. All parts are molded of sturdy autoclavable polypropylene and steam autoclavable at 121°C (250°C). To further protect tubes during transport or storage while also maintaining stackability, an optional polypropylene cover is available. Dimensions: 254 X 133 X 73mm H (9?" X 5¼" X 2?" H).