Package includes: 1000 ml Lab Distilling Flasks; Middle Ground Mouth: 24/29; Side Ground Mouth: 19/26 * 2 Material: Made of heavyduty 3.3 borosilicate glass Design and benefits: Roundbottom flasks are commonly used to contain chemical reactions for reflux setups and laboratoryscale synthesis. The roundbottom design distributes stress more evenly, making the flask more resistant to fracturing under vacuum, and enables more uniform heating or boiling of a liquid. Quality and manufacturing: Each flask is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the grade raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments. Specifications and compatibility: Capacity 1000 ml. Joints: middle ground mouth 24/29; side ground mouths 19/26, two. This design supports standard joint fittings and multipleport configurations for versatile lab use. Applications and use scenarios: Reflux experiments and labscale organic synthesis requiring multiple ports Vacuumassisted distillation or heating operations with stable, uniform heat distribution Multiport reaction setups where reagents or sampling can be connected through the side joints