The storage box is for use with major brands of screw cap micro centrifuge tubes. This box is designed to hold 25 or 81 tubes upright and separate to provide adequate spacing for sub zero storage. Drain holes are provided in box for usage to -190°C 5¼˝L x 5¼˝W x 21⁄16˝H size fits all standard storage units.

Clear lid gives you a good view of samples and does not require special alignment to close. Posts next to tubes are numbered letting you locate the sample you need quickly. Stackable and autoclavable Made of polycarbonate