Went Shopping....what Did I Buy??

Hey All,
Went to buy a couple of adjustable tail stocks that I ws hoping I could use on my Atlas mill. When I got there the guy had all kinds of "stuff". I ended up as usual buying things that looked cool even though I had no idea what they were! Most of the items are wel used/ dirty/light rust but not anything I can't deal with. Have a few pics though of what is this thing??
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Went Shopping....what Did I Buy??