EXPERT PRO CBN Sharpening Stone, 15000 grit – Mounted on Blank A premium finishing stone featuring CBN abrasive, ideal for ultra-fine polishing and edge refinement on high-carbon and stainless steels. 3 mm polyamide monolayer bond ensures consistent abrasive exposure and long-term stability Cubic Boron Nitride (CBN) offers superior performance on hard steels, including high-carbon and alloy types Faster than diamond in polishing tough steels, while achieving equally perfect edges Shock-resistant and dimensionally stable under repeated use Mounted on a laser-engraved aluminum blank: 160×25×4 mm Working surface dimensions: 150×25×3 mm Perfect for final sharpening and mirror polishing. Use with oil, soapy water, or abrasive slurry to prevent abrasive loading, especially on sticky or alloy steels.