Auto Parts: Wheel Bolts, wheel bolts, bolt size

Question
What is the wheel bolt size; ie, the bolt that holds the wheel on? I know it isn't a common bolt but I want to get some studs to help align the wheel when I rotate the tires.

Answer
    Every car uses a different size bolt.  And, most cars don't even use bolts, they use the hub to locate the wheel.  If it's a common U.S. car it will use studs pressed into the hub.  They will be pressed very tightly and will need a hydraulic press to remove them.