The mating end of these borosilicate glass joints have a flat flange with a finely ground face for a liquid light seal. Overall length is approximately 8". For use with horseshoe shaped clamp (LG-7316), sold separately. Scientists rely on the expertise and artistic skills of Wilmad-LabGlass' engineers and glass specialists to manufacture NMR and EPR consumables and laboratory glassware of the highest quality. Used daily in academia, healthcare and chemical, petroleum and other industrial applications, Wilmad offers 7000+ items as part of their standard catalog as well as custom fabrication for individual glassware, glass repair services and OEM glass parts.