With the concentric grooves, they are essentially grinding tools- though if you give them a good scrub to get rid of grit particles, you can pour pitch on them for polishing.
********
There are basically, only 2 ways to use them- TOT, or TOB.

I used to use a female tapered pin socket with a 1"-8 female thread adapter for use on Strassie polishers. Literally dozens of ways to adapt them for either spindle or quill use. The only limits would be skill or imagination.
Mark