This 30mm polypropylene (PP) test tube rack has molded-in handles making carrying tubes easy. Holes are keyed with molded-in numbers and letters for easy identification of tubes. When empty the rack can be stacked with any other racks of the same length. Superior chemical resistance. Holds twenty-four 30mm culture tubes in a 3 x 8 array. Non-autoclavable. Material: polypropylene (PP). Tube diameter: 25-30mm. Array: 3 x 8. Size (L x W): 32 x 11.5cm. 1/Pack; 4/Case. Nalgene® #: 5930-0030.