Hollow Hex Borosilicate glass Stopper with Round end Cone Size 12/21, Each

Details

Hollow stopper made of high quality, 3.3 borosilicate glass. Stopper features a hexagonal shaped top and a round end. 12/21 cone size. Stopper measures 1.55" in total length. Top measures 0.6" long and wide.Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.