The first diamond sharpener to combine convex and concave abrasive surfaces. The uniquely designed DMT Wave affords longer sharpening strokes over traditional slip stones; providing a 1.59mm radii tapering to 25mm radii; accmodating all curved gouges. DMT offers the Diamond Wave in two grits (600 or 1200). One tool can properly maintain a wide range of curved surface tools; such as carving and woodturning tools. Fine.