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Body hardness 360HV(360HRC)is representative one to provide flexible elasticty of which each side of body is de-carbonized for 2 point/ bending process and it is completely harmonized with edge hardness 660HV(58HRC) for perfect bending-adility. The picture is actual and 120 magnified showing heat-treated edge.
More shapened edge 42 provides reduction of working pressure as dust and sliver(about up-to 50%), also contribute to environmental preservation.
Ultra-coated steel rule provides reduction of working pressure togethrer with anti-rustsolution, and friction reduction and it to stay shrap longer which results in longer cutting life.