3. two fingers, one thumb *unless ball has a balance, or weight hole to make the ball USBC legal.
There are typically three holes in a bowling ball. One each for the thumb, middle and ring fingers which allow you to grip the ball.
The most common number of holes in a bowling ball are 2 finger holes and a thumb hole. Sometimes there is a counter weight hole and sometimes there is a hold for the remaining fingers.
It depends on the bowling ball
obviously a bowling ball without holes, how could something with less material in it weigh more
For a USBC certified event, the ball must meet a set of criteria, which is usually up to a 3 ounce difference in top weight and 1 ounce for thumb, left and right side weight. Drilling holes for fingers and thumbs usually compensates for this when drilled in the standard location. Usually a ball without holes will not meet this requirement and need to have either finger holes or a counterweight hole drilled to bring the ball back to legal specs.
There are three holes drilled into a typical bowling ball. These are for the thumb, the index finger, and the forefinger. Occasionally there will be added holes, but this is very rare.
Normally there are 2 but you can have up to 4 finger holes .on a bowling ball fpr approval of the USBC
To hold the ball!