The sharpener is just fantastic. Just the right size with both a flat and a rounded side. I am a firm believer in whetting stones for my knives and bonsai tools but the diamond sharpener makes an easy job of sharpening or resetting the tricky blades of bonsai tools and scissors. On occasion when I have time I will still use my stones to refine the sharpness of my tools but the diamond sharpener is now my number one tool. A true time saver!