Does anyone recognize this door part?

Question

We put up two old french doors, and at the top they each have a spring loaded metal ball that supposedly keeps the doors shut. I believe they are supposed to slide up against something when they are closed. But I'm not sure what to get for the doorway, whether something exists, or if I have to make something myself. I'll include this picture, sorry for the poor quality.

Answer 1

There should be a Striker plate much like the ones on a standard doorway.

Answer 2

That spring loaded steel ball is known as a ball catch or sometimes as a bullet catch. If you search for either of those, you'll also find the matching strike plates that you need.