1/2 X 12 Inch Coarse P80 Grit / Medium P320 Grit / Fine P800 Grit / Ultra Fine P5000 Grit Knife Sharpener Sanding Belts, 10-Pack Assortment. Compatible with Work Sharp Knife and Tool Sharpener (WSKTS and WSKTS-KT only). Premium aluminum oxide (coarse, fine, and ultra fine grits) and ceramic (medium grit) metalworking materials designed specifically for knife sharpening, honing, and grinding. Flexible yet durable cloth backing. Industrial abrasive belts combine a precision cut with long life. Precision engineered bi-directional tape joints allow belts to run either direction. Hand built in the USA by Red Label Abrasives.