This is a new set of bowling ball pitch gauges, 3d printed, small blue one will measure 31/32 finger holes, the red is made for larger thumb holes and the gray is designed to measure both JOPO and Switch grip outers.  an inexpensive alternative to the aluminum units currently available.  I currently have only ten sets available, I can print more if interested, message me and I can create another listing.  colors may vary from the photos