Both 15 and 50mL tube grids included with each boxRobust, rugged polypropylene construction for repeated storage. Snap-in one of the two included grids – either 15 ml tube grid or the 50 ml tube grid. Deep grid wells securely hold tubes upright. Locate tubes easily with keyed lid, imprinted grid, and first tube orientation. Remove inserts altogether and use as storage for product that does not fit into a conventional box grid. Or, remove inserts and fill with ice for a temporary low temperature workstation – ideal for teaching labs or those with limited bench space. View tube storage through clear lid with translucent sides. Autoclavable. Measures 125 x 125 x 129 mm. Pack of 5.