This cooler safely holds thirty-two 0.5 to 2.0mL microcentrifuge tubes or cryogenic vials at a temperature below -15°C for approximately 1-1/2 hours. Included inserts adapt wells to hold 0.5mL microcentrifuge tubes. The polycarbonate cooler body is filled with a non-toxic gel, which cannot contact tubes ensuring that markings and labels on tubes are safe. The gel-filled polycarbonate lid extends temperature holding time and is secured closed with a built in wire carrying handle. Corresponding tube positions are printed on the keyed lid and near each well. Coolers are stackable and have rubber feet to prevent sliding on the lab bench. Ideal for protecting valuable samples stored in a freezer with defrost cycle. L x W x H: 24.3 x 15.7 x 14.6cm. Weight: 2kg.