Made of high quality, heavy duty Borosilicate glass 250ml capacity Top and side joints 24/29 size socket Stands 5" tall. Base measures 3.5" in diameter. Side socket arm measures 0.9" long Perfect for any science or home laboratory 250ml capacity Buchner filtering flask made of high quality, heavy duty borosilicate glass. Interchangeable joint and side arm. 24/29 size socket. No stopper included. Flask measures 5" tall. Base measures 3.5" in diameter. Side arm measures 0.9" long 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.