The grade of the cloth defines the coarseness or fines of the abrasive. Emery is rated on the average grain size glued to the backing. Common sizes are, from coarse to fine: 40, 46, 54, 60, 70, 80, 90, 100, 120, F, and FF. A 46 or 54 grade cloth is used on roughly filed work, while 60 to 90 grade cloth will give a good polish.
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