The Switch Grip Outer Sleeve requires a 1 1/2" drill bit to be
installed. This is the piece you will install in every ball that you
want to use Switch Grip on.
The hottest interchangeable insert on the market. Get the same great
feel in every ball with Switch Grip Interchangeable Inserts. This
revolutionary two-piece insert assembly allows bowlers to remove and
interchange thumb inserts from one ball to another for the same fit and
feel every shot. No more fussing and fighting installing and removing
With just a simple "Twist & Click", bowlers can make a ball
change using the same thumb or better yet change thumb size due to
shrinking or swelling.