Professional, 2-Stages for sharpening and honing/polishing for a razor sharp, durable, arch-shaped edge for 20 degree class knives 100% diamond abrasives in Stages 1 and 2 sharpening technology for an extremely sharp edge with lots of “bite” For sharpening straight edge and serrated knives, kitchen and household knives, pocket knives and sports knives Precise bevel angle control for a 20 degree edge “Soft Touch” handle for an easy and secure grip