What is the difference between the DMT Duo-Sharp line of stones and the DMT Dia-Sharp line of sharpening stones?
The Dia-Sharp is a continuous diamond surface while the Duo-Sharp is a interrupted diamond surface. While both sharpen equally well, there are specific situation where you might prefer one over another. The Dia-Sharp’s continuous diamond surface is helpful when you have pointed tools. Pointed tools can get caught in the recesses of the Duo-Sharp’s interrupted surface. The Duo-Sharp’s stones are backed by a plastic base. This plastic base makes the stones much lighter and therefore more portable. The recesses in the Duo-Sharp also tends to hold the swarf (metal filing made when sharpening) so it is not in the way of your sharpening.
