Special Features:

Both ends chamfered 0.031 in. By 45 deg; two no. 6-32unc-2b thd holes on periphery, spaced 180 degrees apart, 0.125in. Distance from threaded end tocenter of holes; four 0.156 diameter holes in two places on periphery, equally spaced, 0.650in. And 1.937in. Distance from threaded end to center of holes

Properties:

An item consisting of a cell, optical element in which is secured one or more optical elements, such as lenses, reticles, filters, windows, and the like. May include retaining rings, spacers, and/or separators. For items with focusing facilities and/or a diopter scale, see eyepiece assembly, optical instrument.