Type 304 stainless steel rectangular tube rack holds up to 70 each 12-13 mm diameter tubes in an upright position. Type 304 stainless steel adapter plate may be placed on top of rack to accommodate up to 70 each microcentrifuge tubes. Includes solid steel bottom. Ideal for use with FreeZone Small Tray Dryer, Bulk Tray Dryer or Stoppering Tray Dryer.