This cone/screw thread adapter is made from borosilicate glass with a 29/32 cone size and a thread size 13 that fits a 6-7mm diameter through the screw cap. The adapter measures 3.5 inches long and 1 inch wide at the widest point. The borosilicate glass is autoclavable with heat tolerances including a Strain Point of 515°C, Annealing Point of 565°C, and Softening Point of 820°C. Suitable for connecting jointed glassware to threaded fittings in chemistry laboratory apparatus.