The aperture of multi-functional tube rack is Ø18.2mm, that can accommodate any tubes whose diameter is ≤ Ø18.2mm, like the following tubes:
 -12 x 60 mm tube
 -12 x 75 mm tube
 -13 x 75 mm tube
 -13 x 100 mm tube
 -15 x 100 mm tube
 -15 x 150 mm tube
 -10mL centrifugation tube
 -15mL centrifugation tube

The rack is 50 wells, in the lower board with a silicon gel gasket, to fix the tube bottom, and to avoid tube’s wobble in the rack.By the connecting holes in the lower board, can form 100 wells,150 wells, 200 wells tube racks.