Stack empty Nalgene™ Polypropylene General Purpose Test Tube Racks with any other racks of the same length. These racks are available with handles for easy carrying. Holes are keyed with molded-in numbers and letters for easy identification of tubes.
- Superior chemical resistance make these compatible for many chemicals in the lab
- Higher specific gravity than water so stays submerged in a water bath—won't float
- Note: These racks are not autoclavable