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This 30mm half-rack Unwire test tube rack is more space-efficient than full-size test tube racks. This half-rack holds nine 30mm test tubes or centrifuge tubes in a 3 x 3 array. Fits easily in ice or water baths and won't float. It has all the features of full-size Unwire test tube racks. Molded in red acetal plastic with Resmer manufacturing technology which makes the rack keep its bright color longer. Useful in a wide temperature range with good chemical resistance. Autoclavable. Color: red. Material: acetal plastic. Dimensions (L x W x H): 109 x 109 x 84mm. Capacity: 9 tubes. Tube diameter: 30mm. Array: 3 x 3. Nalgene #: 5972-0530.