Cuticle Nipper Double Action with Safety Lock Available Sizes. 11 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°. Cuticle Nippers are available in different jaw sizes: 4mm, 6mm, 8mm with box joint ro lap joint.