I recently acquired this telescope stuff. I know these are mirror making devices, but not sure exactly. Can anyone tell me exactly what I have here?  Thanks

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You appear to have the ingredients of a a pitch-lap mirror grinding set, with a couple of small blanks and two larger blanks with a matching grinding tool, plus a curve tester and a small amount of grinding grit, polishing rouge, and a large bag of something else (maybe pitch?).

One of the two smaller blanks could be used as a tool to make the other matching-size blank into a mirror.

The larger tool (the one with the cross-hatched lines on it) could be used to turn each of the other larger matching blanks into mirrors -- assuming their diameters match.

If you haven't done this before and don't know someone who could teach you, just Google "ATM mirror making" and you'll find sites that have instructions and/or components to help with this. I have done it a couple of different times, but that was decades ago ... !

Thanks for the info. A friend of mine gave me all that stuff after he heard I was into astronomy. He said he wasn't going to use it and I could have it. Maybe I'll try my hand at ATMing...Also, thanks for the answer to the mounting question.