Add wheels to your luggage!

Step 2 Mark!

Now take your drilled-out metal plate and position it where you want it to be on the bag. In my case, it's on the bottom, which is probably where you also want your luggage wheels.

All we do here is take our pen and put it in the holes we just drilled to mark the bag underneath. This way, we'll know where to put the grommets so they'll line up right.