Gesswein Abrasive Ruby Stone Half Round Shape 4" x 4 3/8", Coarse Grit

Gesswein Ruby Stones are used to hone carbide and cut the hardest steels. Use these dry or with honing oil to grind, touch up or deburr steel and carbide parts. Gesswein Stones are made from pure sintered crystals of synthetic ruby. No bonding material is used, therefore, these stones are resistant to changes in shape and are extremely hard. Gesswein Ruby Stones are also recommended for used with glass quartz and porcelain. They have outsanding resistance to wear, leave very little grit on a sharpened blade, and are more economical to use that other comparable tools.