From the USBC Equipment Specs Manual:
Holes:
The following limitations shall govern the drilling of
holes in the ball:
1. Holes or indentations for gripping purposes shall not
exceed five (5) 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.
--------------------
Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah
Brunswick Pro Shop Staff
www.brunswickbowling.comThe opinions expressed are solely those of the writer and not of Brunswick Corporation.