Good knives deserve to be well looked after. Keep yours razor sharp with this water whetstone which has rough and medium sides. Use the rough (beige) side when blades are completely blunt, chipped, or damaged and the medium (blue) side to maintain a sharp edge. With large and small guard rails to keep the perfect angle when sharpening your Global knives and a plastic base with non-slip feet, it is a complete whetstone kit to keep your knives as sharp as new.