Guttermann Bulky Nylon Textured Overlocking Thread???
 

What is this? What do I use it for? Thank.

It's normally used in a serger or cover stitch machine.

Thanks Princess. After I hit "send" I realized I could have looked this up myself on the web. I am so used to just asking you nice folks.

Sorry.....

I certainly wouldn't be any thread I would use for quilting.