ONLYKXY 50 Pieces Shoe Boot Lace Hooks Buckle Rivets Loop Ring with Rivets, Shoe Boot Buckle

How are they applied?

Are these clamshell in design? I do leatherwork and am looking for something to mount through a chain link so I need to open/close sides before attach

What kind of tool do these need to be set?

Isn't a specific size of mandrel and punch needed to install these? Where can the required installation tooling be obtained?