400 and 600 are very rough abrasives.
I would not use them on my rolling mill.
If your rollers are polished, the rollers
will sustain scratches.
I would not even use 4/0.
Crocus cloth is much finer.
What means ‘abrasive belts too narrow
for the rollers’?
I buy mine at the local community college book store.
Emery paper 13 3/4x9 inches. Big paper and easy to recognize
2/0 $1.50 a sheet
They also sell crocus cloth.
The first three entries are from the "ALLCRAFT Tool and Supply Company,
Bill in Vista California
the climactic wonderland