This quartz glass tube is very large with a length of 77 inches and an inner diameter of about 6 inches. It is used in process chambers, tubes and parts for semiconductors, photo-voltaic and industrial applications; although, we are unsure on what the tube was specifically designed for. There is a smaller tube inside of the large glass that goes about 68" in, it has a smaller inner diameter of about 1/2 of an inch. The tube is in very good condition.
~ 1/2 Inches
Heraeus Large Quartz Glass Semiconductor Tube 77" , 6" Diameter