Steel wool discs Ø 406 : There are different levels of abrasiveness in the different varieties of steel wool. They can be classified as fine, medium and coarse. Fine grits, ranging from 0000, 000 to 00, are mainly used for polishing, with 0000 being the finest. Medium grits, represented by 0 and 1, are suitable for cleaning tasks. Coarse grits, from 2 to 4, are designed for stripping operations.