Liebig Condenser made of high quality, heavy duty Borosilicate glass. Condenser is equipped with glass, threaded connectors on each side arm. 29/32 socket size and cone. Condenser measures 18" in length and is 1.2" in diameter. Connector arms measure 0.8" in length. 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