These Ivan brand black / gunmetal ring spring poppers are perfect for use with medium weight leathers.
The caps measure 13mm across and this size of popper can cope with leather of up to about 2mm thick. They're also great for use on fabric projects.
These rivets are fitted with a 13mm popper fitting tool which is shown below in related items.
The stems of these press studs have a 2.8mm diameter so it is recommended that you punch a 3mm hole in your leather to fit them.
This is a pack of 10 poppers. Discounts are available for purchases of 10, 20 and 50 packs.