it is a bushing, 22 mm total length,roughness is required in both ends (5.6 mm) we we'll use a CNC machine, in this case diameter tolerance is 3.5 mm -0.02 - 0.04, 1mio pcs per year, concentricity 0.05 mm, I was looking for a burnishing roller tool but the minimum size I found was 5 mm,
