Plastic Rack for Micro Centrifuge Tubes (2 Ml, 1.5 Ml), Freezer Storage Box, 72 Position Good for microcentrifuge tubes (0.2 to 2 ml) and cryogenic tubes. Hole diameter: 10 mm. Freezer safe. Transparent Cover for easy viewing. Color may be different from shown. Plastic microccentrifuge tube storage rack. Size: 7"x4"x2". Holds 72 tubes in 6 rows.