sreding

Hello, I'm looking for the type of snap that is used on most 'work' type clothing (Carhart, dikies etc). Instead of having a post they have two 'barbs' or wires that get folded over. They seem to be much more durable than post type line 24 snaps that I've been using (have a lot of issues with them pulling apart especially on 9/10oz leather). If anyone knows what these are called or where I can get them I'd greatly appreciate it! Thanks, Shawn