Small 50-place polypropylene box holds 1.5 and 2.0 ml tubes and other tubes with a maximum 1/2" (13 mm) diameter. Permanent dividers are 27 mm tall. The contoured base provides venting for easier opening. Withstands freezing (-90°C) and autoclaving. Box with lid measures 5 3/4" L x 3" W x 1 1/2" H.