This round rack can hold 20 cryotubes tightly in a circular pattern formed by 12 outer and 8 inner openings. Ideal for holding cryotubes during work or incubation. Rack can float in water and can also be used for quickly thawing frozen cells in a 37 °C water bath. 33/4 diam. × 1/4 in. thick with 3/4 in. legs.