The StonyLab Glass 250ml Heavy Wall Single Neck Round Bottom Flask with 24/40 Joint is a high-quality laboratory flask designed for precise and accurate measurements. Made from durable borosilicate glass, this flask features a round bottom and a 24/40 joint for easy handling and connection to other glassware. With a volume of 250ml, this flask is ideal for various laboratory experiments and is a must-have for any research or education setting. Its sturdy construction and reliable design make it a valuable addition to any lab glass collection.