These Green Racks, from Alpha Laboratories Shades Range of 3-Tier Test Tube Racks, have been designed for the safe storage and handling of up to 60 tubes with a maximum diameter of 16mm. The racks are made from polypropylene and offer excellent chemical resistance. Shades Test Tube Racks are stackable and perfect for any laboratory benchtop. They are safe to use in the freezer and provide firm support to tubes placed in a water bath. They come in a range of pastel colours and measure 270mm (length) x 135mm (width) x 64mm (height). They can be used with all three tiers for taller tubes and the top tier can simply be unclipped for the rack to be used use with shorter tubes. The Shades Test tube racks are freezable to -80ºC and Autoclavable to 121ºC. They are compliant with US FDA requirements. The Shades 3-Tier Test Tube Racks are supplied in a pack of 5 racks.