I'm selling these whetstones to organize my collection, as I've accumulated quite a few for work. These are natural whetstones from Kyoto, suitable for finishing. The five surfaces other than the sharpening surface have been protected. They are also good for sharpening plane blades, chisels, etc. Although they are not very large whetstones, if you are used to sharpening, you can sharpen large blades with them. If you take your time and sharpen carefully, you can achieve a sharp blade. They are not perfectly square, so the size is difficult to determine, but they are approximately 140mm x 65mm. The thickness is also not uniform, but it's about 35mm to 40mm. #NaturalWhetstone #naturalwhetstone #Finishing #diy #CarpentryTools #Plane #Chisel #MadeInKyoto #Coppa (small piece) #KitchenKnife