The Almicro Automatic knife sharpener will sharpen anyAlmicro or similar knife upto and including 120mm in length.There is an electrical timing device which is set for desired time, depending upon the condition of knife.The transparent plexi glass cover encloses the entire working mechanism and provides a safe dust and grit free sharpening process. The knife strokes against a high frequency glass joining plate and after three exactly equivalent strokes one sideof knife edge, a cum followerautornatically flips the knife and three strokes are honed on other side The stroking cycle is repeated continually for duration of setting on electrical timer. Overall dimensions 16"x10"x11" and approx. weight22kg.