The Diamond Pro 2-stage knife and scissor sharpener feature coarse and fine sharpening slots. The coarse slot includes preset diamond rods set at 35 degrees combined angles to quickly sharpen European / American style straight edge knives. The fine slot?S triangular shaped ceramic stones sharpen at 37 degrees combined and are perfect for finishing the edge of the knife and for everyday honing. These triangular shaped ceramic stones are ideal for sharpening serrated knives. This versatile sharpener?S patented scissor sharpener works on both right and left handed scissors featuring floating ceramic rods. Blade guide: straight edge blades: yes serrated edge blades: yes (ceramic slot only).