This is the ultimate sharpening device. Includes fine, medium, and coarse stones. The coarse stone quickly restores badly worn cutting edges, while the medium stone produces the average edge needed for many tools, and the fine stone hones to a sharper edge. This system is used by pouring the oil directly into the reservoir and turning the stone holding assembly so that the sharpening stone becomes submerged in oil. As you progress from grit to grit, you will always have an oiled stoned ready to use. The dimensions of the stones are 11.5 x 2.5 x .5-in. All are held in a sturdy non-skid case with cover. It also comes with a pint of Norton sharpening oil. This sharpener has been used by professionals in the restaurant and meat industry for years.