What is this tool thread?

These came with a tool chest I bought; the man I got it from said it came with the house he bought. Previous owner was a mechanic. I'm guessing these have something to do with lifting heavy things, i.e. engines? But some look a little to lightweight to be lifting brackets. Any guesses?

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those are all OEM I think. If you look at 72--ish and later you will see them here and there. Some of those appear to be Ford, some Mopar