Rod Length: 25.5cm Global Sharpening Steels - for fine tuning and honing you can use Globals ceramic and diamond steels. Global ceramic and diamond rods are used in the same way that traditional steels are used to sharpen other knives and, as they are made from the two hardest materials known to man, are suitable for sharpening all good quality knives. A diamond rod is harder than the ceramic rod and will bring back a knife edge quicker. The diamond rod also will not break if it is hit or dropped unlike the ceramic rod.