1.The material is the same concrete nail # 10 that made the ring tool about 8 years ago. Diameter 3.8 m/m, length 75 mm. Link to [Ring tool]

2.Heat the nail with a gas burner until it becomes yellow.

3.Repeatedly hitting with a hammer and heating, it is OK if the thickness is less than 1 mm.

4.Cut out the nail's head part.

5.Shape and polish with a belt sander.

6.As there is a rotation center about 25 mm in diameter, press the works on this and bend it.

7.The nails are tempered, so they can be easily bent with a mallet.

8.Finished bending.

9.Heated again with a burner, and oil-harding. The oil used engine oil.

10.After hardening, the surface is oxidized to form a black film.

11.Will restore its gloss on sanding.

12.Next, make the handle section. The material is Japanese ash. Turning a cylinder 25 mm in diameter.

13.Turning to a shape that is easy to hold.

14.Drill a 3.6mm hole ‚†or insert the blade.

15.Insert the blade into the handle. After sharpening with a grinding wheel, polish with a PIKAL.

16.Polishing completed. This is a push-type hook knife.

17.This is the type to pull and cut.

18.The handle was fixed to the ditched wooden base with paper tape, and the name was engraved with a laser machine. The size is about 20mm * 10 mm.

I think that it can be engraved well on the curve.

How is the sharpness of the knife?