An interchangeable disc that affixes to the rolling mechanism of any HORL 3 or HORL 3 Pro knife sharpeners, this extra fine whetstone disc is a replacement part. It is best suited to sharpening blunt Western or Japanese knives, and can be used after the HORL diamond grinding disc to make high-quality knives even sharper. To use, simply twist off an existing disc from a compatible HORL 3 roller, replace it with this one, and sharpen, followed by honing to realign the edge. The extra fine whetstone disc can be used without water and has a fine grain to provide an extremely sharp knife with a smooth cutting edge. Not compatible with HORL 2 sharpeners or accessories.