Heel or toe studs. I should know. A shoemaker amongst other things, my father made my shoes in the 1960s. I still have tins of them, & two of his steel triple lasts, plus leather darning needles, glue tubes, rubber patches etc.
He made belts too.
And I have cobbler’s (those too!🤣) sheepskin mittens for polishing shoes to army parade standard.