Modified this vintage Cold Steel Shinobu tanto from the '80's into a much pointier version, with a slightly convex zero secondary edge of +/- 30 degrees inclusive & matching straight edge bevels.Not yet finished with polishing the edges (still have 0.25 micron to do), but after 1 micron diamond compound they already whittle one of my chest hairs about 3,0 cm from the point of holding.All work and no play makes Jack a dull boy,