Flask Boiling -Screw Thread, Flat Bottom 500 ml Socket 24/29-EIS-CH01004I offers a thoughtfully designed, durable resource for hands-on learning. Made of high quality, heavy duty Borosilicate glass. 500ml capacity Interchangeable, screw thread joint. Socket size 24/29. Flask measures 6" tall, 2" diameter base, 4" width at the widest point. Perfect for any home, school, or professional science laboratory. 500ml capacity boiling flask made of high quality, heavy duty borosilicate glass. Interchangeable, screw thread joint. Socket size 24/29. Flask measures 6" tall, 2" diameter base, 4" width at the widest point. Autoclavable, with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.