The new Holdfast® Cylinders put an end to the difficult task of pouring liquids from large, heavy cylinders into other vessels. These polypropylene-molded cylinders have a double scale with raised numerical graduations for easy reading of dispensed or contained liquids. Each has attached a sturdy handle to facilitate pouring in comfort and safety. The hand opening is 3-1/2" x 1-1/8". The hexagonal base makes the cylinder stable and roll proof. It is chemically resistant and steam autoclavable at 250°F (121°C) Bel-Art