I have a few different bottom bracket spindles. I'm not too sure what they'll be good for, and/or their suggested use.

Also, I'm wondering their orgin, who made them and the country.

Thank you.

The first spindle is labeled "YST-7NL" and "CR-VD"

The second is "3RR-B", "Cr-Mo" and "K-3"



I also have a KoR bottom bracket 1.37x24. What I am wondering about this bottom bracket is what it was originally used for.

I have a SKF sealed cartridge bottom bracket that has "BSA" stamped on the left side. Stamped THUN 1.37x24. What's up with this one as well?