This is polycrystalline diamond polishing bar (poly diamond polishing wax), size 50×25×12mm, grit 1μm, diamond concentration 2.5%. Polycrystalline diamond features excellent self-sharpening performance, high removal rate, less scratch. Widely used for knife, blade, hard alloy, carbide, ceramic mirror polishing and sharpening. Stable polishing effect, easy to use. Custom grit & size available.