A beautiful 70mm finishing kanna made by Tsunesaburo. Aogami (Blue steel) #1 forget from thick stock and compressed into a thinner layer, wrought iron jigane (soft iron backing) made of old British steel used to build an iron bridge and then dismantled. The hole is where the rivets were inserted. Preconditioned oak dai with tsutsumi. A gem of a kanna made to special order only and the guarantee from Tsunesaburo that you can use this kanna pretty much straight out of the box with little sharpening and setting up needed.