I need some help QUICK! Rear brake rotor removal

[Ray Sta.Juana]

I'm taking off my brake rotors to get them resurfaced and I can't get the
rear ones off. The fronts are fine but the rear won't budge. I've tried the
hammer around the edges trick and still no good. Anyone know what the bolt
or thread size is for those holes on the hub of the rotor so I can run to
the parts store real quick? I need to get these done ASAP so if u wanna call
me here's my number: 909-499-8738  Thanx a lot.

Ray S
98 Sentra SE