Pack of 2 Plastic Rack for Micro Centrifuge Cryogenic Tubes (2.0 Ml, 1.5 Ml, 0.5 Ml, and 0.2 Ml), 60 Position Package of 2 plastic microccentrifuge tube rack. Size: 8 Holds 60 tubes in 5 rows. Good for microcentrifuge tubes (0.2 to 2 ml) and cryogenic tubes. Hole diameter: 10 mm on one side, 7 mm on the other side. Freezer safe. Color may be different from shown.