2 Stage sharpening design, one for coarse sharpening and one for fine sharpening; Unique sharpening wheel design make it so easy to use, just pull back and forth; Non slip rubber bottom and ergonomically designed handle is comfortable to hold and secure; Suitable for all knife with fine edge, not suitable for serrated edge. This sharpener is not suitable for serrated edge knife; Do not push downward too hard, it may damage the edge; 2 Stage design, coarse sharpening is for putting the first edge of knife and repairing serious damaged knives; Fine stage is for honing and bright the knife edge.