This 3 x 7 21-position rack is designed for 50mL and 60 mL tubes. It has a diameter of 30 mm.
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The Metal Large 21 Position Rack (N0777641) available separately.
90-Position Large Rack - 6x15, 13 mm
60-Position Large Rack - 5x12, 16 mm
40-Position Large Rack - 4x10, 20 mm