SODIAL(R) 3000 &10000# Grit Knife Razor Sharpener Fine Stone Polishing Whetstone Oilstone Red+White 100% Brand New A fine-grained whetstone lubricated with oil, used for fine sharpening. The Ruby sharpening stone and Agate Stone,For Polishing,Sharpening. Can Make Mirror surface, mirror finish. The Ruby Sharpening stone is made from sintered crystals of synthetic ruby.