These low profile boxes are available in two sizes to accommodate standard 0.5 mL and 0.2 mL micro tubes and vessels of a similar size. They are designed to ensure that the tubes contained will remain in their appointed well even if the box is tipped or knocked when the lid is in place. Store in mechanical freezers or vapor phase LN2* Will fit into most standard freezer racking 0.2 mL tube (9.5 mm max) version has 169 wells in a 13 x 13 format 0.5 mL tube (12 mm max) version has 100 wells in a 10 x 10 format Complete with well dividers in packs of 10 *Must use tubes capable of being stored at low temperatures.