Made of high quality, heavy duty, 3.3 borosilicate glass 100ml capacity Three angled necks. Center neck socket size is 24/29, side sockets sizes are 14/23 Stands 4" tall, and base measures 2.5" in diameter. Total width of flask is 3.25" Perfect for any science or home laboratory 100ml capacity, round bottom distilling flask made of high quality, heavy duty 3.3 borosilicate glass. Three angled joints. Center socket size is 24/29, side sockets sizes are 14/23. No stoppers included. Flask stands 4" tall, and base measures 2.5" in diameter. Total width of flask is 3.25". 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.