Interlocked rotating racks.

Each module of the Rota-Rack for large tubes holds two 50 mL tubes (30mm diameter), eight 15 mL tubes or culture tubes (17mm diameter), six 20 mm tubes, or ten 10-13 mm test tubes or culture tubes.

Total capacity for 4 modules:
8 x 50ml tubes (30mm), 32 x 15ml (17mm), 24 x 20mm, 40 x 10-13mm.