Jewelers, gunsmiths and dental professionals at some time have a need for small sharpening stones. Spyderco's 400F Ceramic Files include the following shapes: Round, Square, Triangular, and Slip. All four stones are fine-grit, ready to debur hardened molds - even carbide. Sold as a set of four, packaged in a snap-front suede leather pouch. Clean with a plastic souring pad and powdered abrasive cleanser. Autoclave safe.