Quality Performance The professional manual knife sharpener features an iive Vshaped slot design with a spring that lets the sharpening slot expand and shrink, ensuring contact with the blade at any angle for an incomparable sharp and durable edge. Easy to Use and Time Saving 4Stage Sharpening System with a single on/off button To use, clip the knife into the slot and pull in one direction. Sharpen at each slot 35 times to restore sharpness. Practical and Flexible Design The unit has 4 slots Slot 1, Slot 2 and Slot 4 use diamond grinding wheels to restore blade sharpness Slot 3 uses a ceramic polishing rod for polishing The back cover of Slot 4 is removable to allow grinding other tools such as garden scissors or axes Broad Compatibility and Performance Suitable for straight blade knives, serrated knives, ceramic knives, and scissors A detachable ceramic polishing rod is included for grinding special shaped tools and polishing Use Scenarios Home kitchen: sharpen everyday kitchen knives and serrated bread knives to maintain cutting performance Outdoor and camping: maintain camp knives and utility knives for field tasks Garden and workshop: sharpen garden scissors, pruning shears, axes, and other tools using the removable back cover