It took a lot of internet surfing before I found Snaps Tools. Ordering from the USA is just too expensive (shipping) and Australian vendors do not carry much stock but the standard size 20. I wanted to replace plastic snaps on overalls; they kept popping open when I squirm around underneath my vehicle so utility spring snaps were the go. The dies didn’t need an adaptor and the plastic storage container that they were supplied in is typical of Chinese Hong Kong service (nobody does it better than Chinese. I went to my local chemist store and purchased sterile plastic specimen containers to store my other die sets. If you already have dies and are ordering from Snaps Tools I recommend that you include plastic containers (they call them boxes). The small container will hold two dies and the large container will hold four dies.
Overalls got modified. Job done.
