4" (100mm) Flex-Hone Engine Cylinder Ball Hone - 120 Grit, Brush Research GBD40012

Doing an engine rebuild and need to deglaze those cylinder walls?

This is the professional-grade tool for the job.

It’s a genuine Brush Research Flex-Hone, model GBD40012.

This one is 100mm (about 4 inches) in diameter with a 120-grit abrasive—perfect for creating the right cross-hatch pattern for new piston rings to seat properly.

It’s a brand new, high-quality flex-hone that flexes to the shape of the cylinder.

If you want your rebuild to last, using the right tool matters.