Natural polishing stone for Japanese sword.
2nd stone of the groundwork used before Kongo-do(Arato).
By Binsui-do, the mark of Kongo-do or Ara-to must be removed.
On this stage it is important to make the shape of the blade, because the blade will not change it 's shape by other finer stones.
By the end of Binsui stage the outline of Hamon becomes visible.
Dimensions : 21 x 6 x 7cm.
Weight : 2.4kg
