Funnel Thistle 25cm, Borosilicate glass, stout walled-EIS-CH0489B offers a thoughtfully designed, durable resource for hands-on learning. 11.5" total length, 9.5"stem length Reservoir is 1.5" in height with a 1.5" diameter outer diameter of the stem is .5" and the inner diameter is 2/16 Thick walls for durability Thick walled glass thistle funnel from Eisco Labs. 11.5" total length, 9.5" stem length. Reservoir is 1.5" in height with a 1.5" diameter and an interior diameter of 1". The outer diameter of the stem is .5" and the inner diameter is 2/16". This is a great unit for adding liquid to a narrow necked flask or other similar piece of lab ware. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.