The Chef’s Choice Diamond Hone Sharpener 315XV edge is extremely sharp, and the ultimate edge for effortless cutting. This innovative two-stage sharpener combines the strength and durability of the double-bevel edge with flawless ultra-sharp 15 degree edge technology. Easily convert traditional 20 degree factory edges of European and American household knives into the high performance 15 degree edge. It features advanced spring guides for ease of use and accurate control of the sharpening angle. With 100% diamond abrasives for sharpening and honing, it is guaranteed to never detemper edges. The advanced flexible stropping/polishing disks create super sharp, microscopically flawless polished edges. Safe for all quality knives.