Nail Cutter Half Moon Shape Plain Handle, Polish Tip with Matt Finish Double Spring, Box Joint Article. WI-6021 Available Sizes. 12 cm Details. Implements produced for professional usage are made of Japanese stainless steel J/2 – 420, HRC° (hardness) 52° – 55°. Implements produced for personal usage are made of superior quality stainless steel 410, HRC° (hardness) 45° – 48°.