A folding handle double sided diamond 4 inch stone monocrystalline diamonds for fast clean stock removal excellent sharpening performance double sided for coarse sharpening and fine honing coarse 360 grit nom 40 microns and fine 600 grit nom 25 microns coarse ideal for carpentry as it rapidly fixes or restores a damaged edge or blunt tools including chisels and plane irons fine ideal for cabineting making for a fine finish refines the cutting edges of chisels small knives etc achieves a razor ed