Both 15 and 50ml tube grids included with each box.

Robust, rugged polypropylene construction for repeated storage. Snap-in one of the two included grids — either 15ml tube grid or the 50ml tube grid. Deep grid wells securely hold tubes upright. Locate tubes easily with keyed lid, imprinted grid, and first tube orientation. View tube storage through clear lid and transparent sides. Autoclavable. Pack of 5.