Keep your knives cutting and looking their best with the Work Sharp upgrade kit. Fitting E4, E5-NH and EF (sold separately) sharpeners with 15° and 20° sharpening guides, these sharpening belts are used by professional knife makers and sharpening services to create the ideal East and West edge profile. Kit includes 15° East and 20° West sharpening guides, one blue P120 coarse grit belt, two red P120 medium grit belts, one gray X30 fine grit belt and one white X4 extra-fine grit belt.