Talking about the two philips head scews on the rotor? Those suck haha. I had to drill one out the first time I did my rotors. I was even using an impact driver, but it was a cheap harbor freight one, and the bit broke apart before the screw budged haha. I had to send my wife to get me a Craftsman impact driver, and after a good soak of penetrating oil it popped the other three out real easy. I just put one screw back in each rotor with some anti-seize on the threads. I debated putting any of them in, but it does make it easier with the screw holding the rotor in place to put the caliper back on, and when changing pads. (This is just for my fronts, I have the dreaded drums out back )