Bausch and Lomb Vertical Illuminator Attachment for Stereo 1 and 2, StereoZoom 3,4, and 5. It is a reflecting collar for use with the Nicholas, Reflector or General Purpose Illuminators to examine opaque materials such as castings, machine parts, cracks, pits, etc. With reflector and locking device to attach to the stereomicroscope power pods it will fill fields at 12X and above. The mechanical, cosmetic, and optical condition is excellent! Note: This attachment will not fit the Bausch and Lomb Stereo-7.Thanks for looking!