• Concave and convex design at the rear end of the handle to prevent dislocation and protect the fingers. • Foldable fan-shaped structure that offers additional protection and prevents damage. • Diamond surface that allows knives and tools to be sharpened faster and more efficiently than traditional stones. • Interrupted sharpening surfaces that facilitate the collection of metal shavings, speeding up the sharpening process. • Non-slip stripe on the handle that improves safety and grip during use.