A 10 cm, natural stone for easy knife sharpening. Genuine Opinel Product. Natural stone from Lombardia, Italy. Suitable for plain and serrated blades. Supplied loose. Dimensions: 10x2.6x1cm. The small whetstone from Opinel is a gadget that should not be missing in any kitchen. Opinel has made the sharpening stone made of shell sandstones the ideal kitchen utensil for sharpening. Thanks to the grit, the blade gets a very sharp blade within no time. An indispensable tool, whether in the kitchen or in the workshop. The whetstone, consisting of a quartz carbonate grain size 800-1000, lives up to its reputation as one of the best whetstones for knives, scissors, axes, and much more.