Accommodates 75 each 14-20 mm OD tubes. When tubes are 125 mm or shorter, Holder may be stacked with either another 4546200 or Holder 4546300 (sold separately). Washers using stacked Holders are not compatible with an upper rack.
Test Tube Holders are add-on accessories to the Lower Test Tube Spindle Rack. The Holders keep tubes upright. Constructed of Type 304 stainless steel.