Amazon
Grey (coarse) sharpen knives, chisels, shears and machine cutting blades Yellow (finer) use to refine cutting blades Green (fine) complete sharpening process by adding a fine buff to the cutting edge Red – (extra fine) for a refined finish Supplied in workshop stand
Grey (coarse) sharpen knives, chisels, shears and machine cutting blades Yellow (finer) use to refine cutting blades Green (fine) complete sharpening process by adding a fine buff to the cutting edge Red – (extra fine) for a refined finish Supplied in workshop stand