The Glass Stone sharpening stone grain 1000 is a medium sharpening stone from our Glass Stone collection. With this medium sharpening stone you can restore the original sharpness of a blunt knife. Grain size 1000 is a great grain size to end with for, for instance, pocket knives you often use for demanding tasks. A kitchen knife could use a little more sharpness. For those you should first use this 1000 grit sharpening stone, followed by the Glass Stone grain 3000.