Premium Borosilicate Glass Dropping Funnel Socket size 29/32, comes with interchangeable plastic stopper 250ml capacity PTFE stopcock is great for controlling the flow on fluid transfers that require a high degree of accuracy. 14" length, 2" diameter This 250ml dropping funnel is crafted of premium borosilicate glass. It is 14" long with a 2" diameter at the body. The key stopcock is 2 and 3/8" in length and allows the user to customize and control the drip rate when adding reagents. The bottom spout has an outer diameter of 6/16" inches and is 2.5" in length from the bottom of the stopcock. The 29/32 socket comes with an interchangeable stopper. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.