Queen Ant Stack-able Test Tube Rack with Heat Cable Slot

Queen Ant Stack-able Test Tube Rack with Heat Cable Slot This was specifically designed for Queen ant founding and has a heat cable slot incorporated to fit a 4 mm heat cable under the front of the test tubes. It is also designed to keep the bottom of the test tubes at a slight downward angle to help avoid flooding. Fits 16 mm test tubes and can be up-scaled to fit 20 mm easily by adding 5 mm to the X axis measurement in your slicer.