6" overall. 2 1/2" fine grit (25 micron) goldtone diamond surface. If you havent tried this diamond stone, you have a pleasant surprise in front of you. This lightweight, handy sharpener is incredibly good at sharpening all kinds of cutting tools because of the good handle. Diamonds deliver a really good edge on any blade steel you try it on, no problems. In addition, you dont need to mess with oil or water and if you think the DF24 feels soft, wash it off with warm water and some detergent. At first, the diamond stone is a little rough but after a short break-in period, it delivers a very smooth and sharp edge, good enough for almost all purposes. The diamonds are held in place in the matrix by a layer of titanium aluminum nitride which greatly extends the life of the sharpening stone.