The Microtube Rack is designed to to hold up to 48 of the 0.5mL tubes and up to 12 of the 1.5mL tubes. The lid on the rack holds the microtubes in place. After incubation, the rack can be removed from the ice bucket and used as a handy carrier for the microtubes. Legs allow the rack to stand alone on the lab bench. Hand fabricated from 5/16″ acrylic, the complete MicrotubeSystem (RP-900) may be purchased as one piece, or the components may be purchased separately.