#769 Ohzuku Type 30 XL Hard Mirror Finish 5 Hard 5 Fine 1764 grams

Hard mirror finishing stone from Ohzuku mine, not an easy stone to use for inexperienced users, best for razors and knives where hard steel will be worked on, these might not agree with high alloy steels or large carbide alloys. With the use of a nagura, a stone of this hardness and fineness is useful on knives like yanagi or usuba that benefit from a very fine finish on the ura (inside hollow ground side).

This stone might be scratchy at first and will need to be flattened and the face polished with hard tomonagura or hard nagura. 

NOTE

There are a few shiny black lines on this stone; they may be 'toxic' or scratchy. I did not find this one to be that way. The price has been adjusted to accommodate potential later-down-the-line adjustments, such as scratching out a mineralized line, and is sold as is for that reason at a reduced price. 

206x75x44mm 1764 grams