I had never heard of Die Sinker's Riffles until this weekend, and then, when looking in my garage for a caliper and micrometer to bring to work, discovered that I have a set!

the origin of the term, is of course German, and the translation is basically: files for making die molds more perfectly shaped or formed to stamp out metal parts 

you can still buy sets of Riffles https://grobetusa.com/product/6-diesinkers-riffler-12-pc-set-cut-2-item-32-021  but they are now known as Rifflers