These are hard to find in a hardware store and I'm often weary to order online because of quality. However this little adapter is very sturdy and blades are not falling off or loose. I needed this to connect a battery backup that had a 20A plug to a 15A socket so that I could charge it. Worked perfectly. Of course don't expect to run 20A off a 15A plug, that's common sense but in my case I'm just charging the thing.