Bolts on ignition coil
 

I just bought my F-150 in March, and I'm doing some routine maintenance to her. I'm trying to change the ignition coil, and I can't get the bolts off. They're the smallest bolt heads I've ever seen. I put a 1/4" wrench up to them to try and get them off and even that was too big. Any suggestions? Are these pretty standard bolts or did somebody in the past just try to frustrate me? Haha. Any help is appreciated.

Metric, 5.5 MM? Try a SAE 7/32".

The stock bolts are 5.5mm.

Thanks for the help! 5.5mm just like you guys said.