What does USA stand for?
USA stands for Uses the Sharpen
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Samples in periodicals archive:
Fold a sheet of foil several times and cut through it with a pair of dull scissors to sharpen the blades. See the nine other Uses for Aluminum Foil.
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Brush out hair and debris. Cleaning your hair clippers may already make them much easier to use, and allows you to sharpen them evenly and without mess. Use a wire brush, steel wool, or toothbrush to remove the hair stuck in the blades.
The ceramic rod side is equivalent to a butcher's steel. It doesn't remove material; it straightens out the curled metal on the edge. All manner of stones remove material through abrasion and will wear out an edge far faster than the Smith's CCK-2 and similar sharpening tools. The tungsten carbide side is for "really dull knives" that have gotten that way through abuse. Once I sharpen.
Stones have been used as sharpening tools since the ancient days. When selecting a stone, be sure you always choose one that is harder than the knife you are sharpening. That might sound strange, but many people think that all stones are naturally very hard. They are not. Sometimes stones need to be lubricated with oil or water before being used for sharpening. Stones come in fine, medium and rough coarse.