For internal burnishing of holes we have a range of bars starting from Ø6mm.

     Min. hole Ø
DPI 40  Ø52
DPI 25  Ø30
DPI 12  Ø14
DPI 10  Ø12
DPI 8   Ø10
DPI 6   Ø8

 Please see product catalog for more specifics.