These tuck catches are very cool and a really easy way to add a unique detail to a bag or pouch.
They are simple to install and attach much like magentic snaps--put the prongs through the fabric, use a bit of Fray Check to stabilize the fabric fibers around the prong openings, and then fold the prongs to hold everything in place.
These are available in the US only. Sorry international sewing friends, I'm not shipping outside the US right now.
There is a limited supply, so when these sell out the special ends.