After doing some research, I found out that some of the other pieces in my collection that I thought were one thing, were actually thread guides. It did not dismay me though but intrigued me even more. Most of these are unmarked, unfortunatly, but it is neat to discover what they are. The three ones which I thought were wall tubes are actually yarn guides. They measure 5"X7/8", 4"X7/8" and 3 3/4"X 7/8". The three spool types are unmarked except for the third one which is just marked with a 12. They measure 1 3/4"D X 1 1/8"H, 1 5/16" X 1 3/8"H, and 1 3/8" X 5/8"H. This one was marked. The last piece a seller sold me years ago stating that he took a whole bunch down in his garage holding stereo wires up. So I thought it was a neat little no tie wire holder but is actually a thread guide. The person reused them to hold the wires up. It measures 2 1/4"H with screw X 3/4"W . Still very neat. They call this a pigtail for obvious reasons Ha Ha.