look like caphead screws to me...simply grab it with a pair of pliers (and using brute force
) twist it out.
when i am trying to get countersunk screws out, i drill a 2mm (.078" to you imperial guys
) hole all the way down the screw, get a stud extractor (like a screw but with opposite threads on) so when you tighten the stud extractor, it loosens the screw
..works every time and no messy chassis
also, what car is it