after looking at Chris' link for KamSnaps in Australia, I am wondering what size would be the most useful for the home stitcher? There is a 20 and a 16.....are these sizes in mm? Thanks for help.

20 is the most common size. that is what I use and find they work welll on anything I try them on (Snap tabs, purse tabs, sani holder tabs, etc.).

just answered my own question by looking at their Facebook page,Snaps Australia. 20 is 12.4 mm and 16 is 10.7 mm. thanks Fb