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.