Designed specially for use by carpenters and mechanics. Choose one stone or a sequence of stones to quickly restore the cutting edge on all straight edge tools. All oil stones are porous in nature. Oil is required to keep the pores open and working efficiently. Typical applications include restoring the cutting edge on straight edged tools such as chisels, plane blades, wood lathe cutters, draw knives, spoke shaves, knives, and precision tools and delicate instruments. Combination stones INDIB8 are made with one face coarse 150G and one face of fine cut, 400G. Size. 204mm x 50mm x 25mm.