What are these things??? These are what we use to hang lights in both our auditorium and our gymnasium. We call them clips. Pictures Attached. Lighting system installed 1970/1971. A bolt/washer is put on the yoke where the C-Clamp would go, then put into a threaded hole. The two slots "clip" into the raceway, then the bolt is tightened so that the light cannot move or come out of the track. Has anyone used or seen these before? The only good thing I know about them is that they're cheap to make - we needed more last year so we went to a local machine shop and they were only $1.50 each.