Here is the exact text from the equipment specifications. You could probably fill a book with all of the misgivings and pure ignorance people have about the rules:
Holes or indentations for gripping purposes shall not exceed five and shall be limited to one for each finger and one for the thumb, all for the same hand. The player is not required to use all the holes in any specific delivery, but they must be able to demonstrate, with the same hand, that each hole can be used simultaneously for gripping purposes. Any hole that cannot be reasonably shown to be used with a single hand would be classified as a balance hole.