I've got one of the DMT green Extra-Fine hones (larger) and at 9 micron it is, or should be, less agressive to metal than say 1K would be. I have an old "FINE" DMT from years of use and I used to use it to start with, but it is way down the list for grit, something probably like 650 or so. But, it's been used so much over all these years that it seems kind of worn down. Like I said, I wold think the 9 micron diamon DMT would work well if it were rubbed a bit with a slurry stone tnad wront down just a bit.