Flask, Round Bottom, 50mL, Heavy Wall, 14/20 - 14/20, 3-Neck, Angled 20¿. Round bottom, HEAVY WALL three neck flask with standard taper outer joints on the center and 20¿ angled side necks. Indentations increase agitation of the contents of the flask during stirring.Please Note: Morton Style Reactors/Flasks Not Suitable For Vacuum