Made from 304 stainless steel, these thermowells are made using the same process as my stainless steel temperature probe ends.  The end is spun shut and then sealed with a TIG weld.  The entire body is then polished for easy cleaning and the perfect sanitary surface.  Other thermowells on the market are just crimped closed and then sealed with a weld, leaving a jagged rough surface.  I've even seen a few that they didn't even bother to clean the markings off the tubing!

ID = .305"
OD= .375