Made of high quality, heavy duty Borosilicate glass 100ml capacity Top and side joints 19/26 size socket Stands 4" tall. Base measures 2.5" in diameter. Side socket arm measures 0.75" long Perfect for any science or home laboratory 100ml capacity Buchner filtering flask made of high quality, heavy duty borosilicate glass. Interchangeable joint and side joint with 19/26 size sockets. No stopper included. Flask measures 4" tall. Base measures 2.5" in diameter. Side socket arm measures 0.75" long Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.