Abrasive belts for the Work Sharp Blade Grinding Attachment are formulated, designed, and made in America by industry-leading abrasives manufacturer Norton for precision sharpening of high-strength steels. The grit symmetry, spacing, and backing flexibility are all designed to produce the optimal convex edge with minimal heating or material takeoff. This is the finest grit offered for the Blade Grinding Attachment. Ultra-Fine Abrasive Belts are intended for serrated edges, polishing, and stropping. Our special Norton silicon carbide formulation strops and polished your edge for to a mirror finish. These are an exact replacement for the Ultra-Fine grit included with the Blade Grinding Attachment and Tool Sharpener belt assortment.