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I feel that sharperness will continue than both stainless steel blades. I am not sharp yet, but it will be helpful if I can use it for a long time. Although there are circumstances of the manufacturers, I hope to have full compatibility with the replacement blade of Olfa if possible. It is also good to have a knob screw that can turn even while wearing gloves. I searched for existing products, but the screws do not comply with the old JIS standard.
It sharply breaks as the hair shaves. Both NT and Olfa SUS's blade seems to be 420J2, but the sharp edge is much better on the sharpness. When sharpening with a finishing grindstone of about 5000 number, sharpness is easily restored. The material display at this shop is SKS - 81, but correctly it is SK 2 (currently called SK 120).