Round-bottom flasks of any size up to 10 liters are cradled securely in the stepped concentric rings of this support. Supports are stackable affording the ability to create a stable base at various heights. Polypropylene construction is not affected by spilled acids, alkalies, or other corrosive liquids. Steam autoclavable at 121ºC (250ºF). 171mm (6 3/4") in diameter x 51mm (2") high.