Tube-CUBE™ Tube Rack is the do all mini rack.  

Product Features:

• Three configurations that accommodate practically all your needs
  - 4 place, holds 26 mm to 30 mm tubes / 50ml tubes
  - 9 place, holds 8 mm to 16 mm tubes / Blood and Urine tubes 
  - Single place, holds 66 mm cups, alcohol dispensers, small flasks, etc. 
• Invert & Pour - Tubes will stay in place.
• Easily disinfected if contaminated, great for phlebotomy trays
• Organize and store samples in refrigerator or freezer