Gesswein Ruby Stones and Files are made by Friatec-Degussit from pure, sintered crystals of synthetic ruby. No bonding material is used, so these stones are extremely hard and resistant to changes in shape. This is particularly important for quality precision grinding and finishing.In addition, since Gesswein Ruby Stones have an outstanding resistance to wear, they are more economical to use than other comparable tools.Use dry or with Gesswein Stoning Oil to grind, touch up or deburr steel and carbide parts. Ruby stones are also recommended for use on materials such as glass, quartz and porcelain.All are 100mm (4") long, coarse grit in a variety of shapes & sizes. Shape Inch Dimensions mm Dimensions* A. Triangular 4" x 3/16" 100 x 4mm 4" x 1/4" 100 x 6mm 4" x 5/16" 100 x 8mm 4" x 3/8" 100 x 10mm B. Square 4" x 3/16" 100 x 4mm 4" x 1/4" 100 x 6mm 4" x 5/16" 100 x 8mm 4" x 3/8" 100 x 10mm 4-3/4" x 1/2" 120 x 13mm C. Round 4" x 3/16" 100 x 4mm 4" x 1/4" 100 x 6mm 4" x 5/16" 100 x 8mm 4" x 3/8" 100 x 10mm E. Flat 4" x 1/4" x 1/8" 100 x 6 x 3 mm 4" x 5/16" x 1/4" 100 x 8 x 6 mm F. Half Round 4" x 3/8" 100 x 10mm I. Knife Edge 4" x 5/8" x 1/8" 100 x 15 x 3>0.5mm J. Tapered withRound Edge 4" x 13/16" 100 x 30 x 7>2mm
