Interlocked rotating racks.

Each module of the Rota-Rack for small tubes holds six 15 mL tubes, nine 1.5/2.0 mL tubes, twelve 0.5/0.6 mL tubes, or thirty-two 0.2 mL PCR® tubes or four 8-tube strips.

Total capacity for 4 modules:
24 x 15ml tubes, 36 x 1.5/2.0ml, 48 x 0.5/0.6ml, 128 x 0.2ml or 16 x 8-tube strips.