Dolan-Jenner oem ring light assembly made it USA
High quality glass fiber, large 0.365" bundle diam. 0.55 numerical aperture
Fits 60 mm diam. Objectives securely with 3 thumbscrews
Working distance 4" - 7" for great versatility
0.562"(14.3Mm) end fitting, (requires adapter to "a" type 25 mm light source:sx-10, mx-10)