These (the 0.9mm ones) are the same as the one I bought. They were advertised as copper, but turned out to be brass.
My first test was to turn a centering punch for them on the lathe, set up a press, try on a blank PCB.
Next was going to be testing with inked boards, which would mean reworking board layouts with larger vias to suit, and then seeing whether the solder would work reliably - and of course then other work got in the way, so this is still pending!
