Shapton 6000 Grit High Carbon (HC) GlassStone Waterstone Sharpening Media: 1/4 in, (5mm) thick Working surface: 8-1/4 x 2-3/4 x 1/2 in. (210 ? 70 ? 10mm) Glass Plate: 1/4 in. (5mm) thick precision ground tempered glass Made in Japan