Fine Abrasive Belts are intended for refining the sharpened edge of a knife or tool. Work Sharp’s special Norton NORaX alumina oxide formulation refines and finishes your edge for a factory-sharp experience. These are an exact replacement for the Fine grit included with the Ken Onion Edition Knife and Tool Sharpener belt assortment. White X4 Fine 3000 Grit. Includes 5 belts. For use with the Work Sharp WSKTS-KO Ken Onion Edition Sharpener. Made in the USA.