I picked up these antique nails on my travels last year, when I asked what they were from I was told they were the nails that held Christ on the cross. I highly doubt that’s what they are but an interesting story none the less.
Use 4 of them for nailing down the corners of your property, or hammer 3 of them in a triangle shape above your doorway for protection.
When these are gone they are gone. Read more lore about nails over at Three Hands Press.