Custom made hand tool to resize, open, shape, or smooth your thumb/finger holes. Easy to use on the go for at-home modifications to the fit of your bowling ball. Firm straight-edge maintains even sanding from the different materials of a bowling ball.

This “Rough” tool is used for taking out a moderate amount of material. Leaves a rough surface on the walls of the thumb hole that should be followed up with the “Smooth” Tool.

A 2-Pack combination of both tools is also available in my listings.

Message me with questions.