Easily customizable. The Heavy-Duty Vortex holder accommodates foam racks for 0.5 ml to 50 ml tubes. For microplate applications select from four configurations to hold up to eight microplates. Double the capacity of your Microplate Vortex Mixer with the two-plate holder accessory. The interlocking design secures the holder in place. For high-throughput applications choose from six Multi-Tube Vortexer Foam Racks. Ideal for tubes ranging from 10 to 29 mm diameter.