The DMT D8C is a diamond hone made by DMT, it is their 8 inch long "Coarse" hone and is rated at 325 grit.

All DMT hones are guaranteed to be flat to within a tolerance of .001 inches over the length of the hone, so they make great lapping plates for keeping your other stones flat.

There are a full line of hones from DMT that go; 120, 325, 600, 1200, and 8000 grit