GE Heating Element Replacement

Trying to replace the lower heating element. The instructions said to remove screws. This is not a normal screw to remove with a screwdriver. I then tried my ratchet set without success. What tool and size tool will remove the two screws?

The parts show it as a 7/16 hex but by the sound of it they may have changed this.

Could it be a Torx?
Looks like a star.
Torx - Wikipedia, the free encyclopedia