With just one Diamond Wave Sharpener, you can now properly maintain the cutting edges on a wide range of curved cutting tools, such as in-cannel and out-cannel gouges, carving tools and wood turning tools. The uniquely designed Diamond Wave features a variable radius from 0.0625'' to 1'', accommodating all curved gouges, and it's the first diamond sharpener to combine convex and concave abrasive surfaces. It's easy to use - just slide the tool along the wave to match the radius, then sharpen with short back and forth strokes. The fine diamond abrasive (25-micron/600-mesh) makes for a razor sharp edge. Made in USA.