I was looking for more quick disconnect air fittings when I stumbled on to these hose ends. When I started to look closer to see if they had them in my "style" of hose end is when I realized that they were meant for use with ANY quick disconnect! As soon as I read that I ordered them and what a find. I have already changed out all the female hose ends in my shop with these. I was running into the issue of having to purchase more male ends every time I ordered a new air tool. Even though most new tools come with a fitting it wasn't what I have been using in my shop. Well that's in the past, since it doesn't matter any more. No matter what comes on the air toll these quick connects work! The added bonus turns out to be the way they work. With the typical quick disconnect you need to hold back the outside collar while you push the male fitting into the socket. This often leads to air escaping as you line up and push the fittings together. Not with these fittings. The locking collar is in a pulled back position when a tool is not connected, so all you do is push the tool into the fitting and the collar snaps forward to lock it in place. No air escaping in the process. Then to disconnect the tool just pull back on the collar and the tool pops off. Also not requiring you to push in on the tool to be able to slide the collar back. I do have two caveats to be aware of, 1) you do need to push a little harder to connect a tool, but its not a big deal since you aren't trying to work the locking collar at the same time. 2) I had one air fitting that leaked badly when I went to use it. Turns out I had dropped it at some point and dented the end of the fitting which was why it was leaking. Just had to replace it. These were a great find and can't recommend enough.