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Moulded polycarbonate boxes with positive alignment of lift-off lid versus box. Lids may be used to index specimen tubes. PC is strong and remains non-brittle in very low temperature freezers. Suitable for temperatures from -190°C to +121°C. The boxes are vented and stackable. The transparent cover allows view of contents and is numbered. The rack insert has numbered holes and may be blue, red, orange or yellow.