This heavy-duty all-polypropylene rack provides efficient and extended cooling of twenty-eight 15 ml or 50 ml centrifuge tubes in a chilled bath. The deep tray, holding approximately 2 liters (67 ounces) of ice and water, allows the tubes to rest on the bottom for maximum stability and exposure to the bath. A flat perimeter rim provides space for labeling tape. The rack is steam autoclavable at 121°C (250°F) and stackable with identical racks when full or empty. To further protect tubes during transport or storage while also maintaining stackability, an optional polypropylene cover is available. Dimensions: 32 x 20 x 15cm H (12¾ x 7?" x 5?" H).