Leatherman knife blades may be straight-edged, serrated, or both. Sharpening methods vary depending on the type of knife in your Leatherman product. (Note: serrated edges should not be sharpened in the same manner as straight edges.)Straight-edged blades can be sharpened using any standard equipment, including whetstones, rods, and various kits.Leatherman’s standard sharpening angle for plain edge blade sections is 32° (16° per side). Serrated blade sections are sharpened to 20° (one-sided).Serrated blades require a sharpening system specifically designed to accommodate serrated edges in order to maintain the curvature of the serrations. Sharpen serrated blades only on the edged side. Sharpening the flat (back) side of the blade will cause the serrations to wear away, reducing the blade’s effectiveness.