For Bowlers interested in installing their own interchangeable thumbs, the Switch Grip Starter Kit is a must have.

Included is a 1-1/2" drill bit with Auto Depth Stopper, 20 Outer Sleeves and 10 Inner Sleeves with pre-installed Urethane Solid and Installation CD.

This is everything you need to start installing Switch Grips yourself.

This is also a Must have if your local pro shop does not want to carry Switch Grips as you can simply hand them the drill bit and sleeves needed to install them for you.