What kind of bolt is this?
This is a pop rivet, not a bolt. It can only be removed destructively. 

Drill out the center with a drill bit meant for metal (as opposed to a brad point bit, for instance) until the flange come off. Use a bit roughly half the diameter of the flange.

When the flange breaks free, it will get stuck on the tip of your drill bit, which you will then remove with pliers.