The MTC Bio C2581 Cryogenic Storage Box with Pull-Off Lid, 25-Place, Polycarbonate, is designed to hold 1.2mL to 2.0mL cryogenic storage vials. An excellent and longlasting replacement for cardboard boxes, the ultra-low temperature boxes are fully autoclavable and can withstand temperatures ranging from -196° to +121°C. They are compatible with all standard 5.25 inch (133mm) freezer racks. Clear lids are hinged and have printed indexing for sample identification purposes.