GBD6 1/2 6" - 6 1/2" 120SC. Flex-Hone tool, also known as ball hones or the ball cylinder hone, is great for deburring, edge blending and surface finishing
While these go by many names dingleberry hone, dingle ball hone; ball
hone, flexhone and dingleberry brush Flex-Hone is the correct name.