Pop-Up™ Tube Racks for 15 and 50mL tubes are simple and easy to open and close, so you can expand and collapse the racks as needed. An imprinted grid aides quick retrieval. Stack racks in open or closed position to save space when not in use. Robust polypropylene construction. Not recommended for cleaning in autoclave. Measures 255 x 137 x 72mm when expanded; 21mm H when collapsed. Pack of 2.