Kimax® flasks with a square cross-section, and a width less than the widest diameter of a usual round flask. Especially designed to take up less area and pack more closely on shelves and in refrigerators or other storage cabinets. All sizes cover 25-35% less area than conventional flasks. The added glass weight and the square section also give flasks greater stability.Graduation ring is blasted on the neck. Calibrated to contain. With a marking spot. ST ground glass stopper is supplied with the flask. Designed from ASTM Specification E288, Class A unserialized requirements.