Suehiro New Cerax 320 (CR-400) Dimensions: 206mm x 73mm x 23mm The coarser stone in the Cerax range will suit your re-profiling, chip removing, broken tip fixing or thinning requirements. Being a medium hardness stone, will give you an excellent feedback as you sharpen. It will wear at the optimal rate in order to uncover new particles on the stone surface that will help in fast cutting. Its storage container can be used as an anti-slip stone holder for ease of use and the whetstone cleaning stone (nagura) will help you clean that clogged stone surface! Allow the stones to soak in water for 5 minutes before use to get the best possible results. Tip: Do not soak them for extended periods and dry them very well before storage.