Pexto Tinsmith Sheetmetal Dimple Punch

[daneiac]

before I list this tool, I want to make sure as to what it is? thought leatherwork circle/hole punch but what is the conical indented cavity for then? seems like with a raise you could make dimples in sheet metal? what is the correct name for this hand tool

[pbshac]

Looks like a rivet set.

https://www.worthpoint.com/worthopedia/9-blacksmith-tinsmith-rivet-sets-pexto-roper
https://www.worthpoint.com/worthopedia/pexto-6-kraeuter-1-a-3-rivet-setting-tools
https://www.worthpoint.com/worthopedia/pexto-rivet-set-setting-tool-137973350