Professional Razor Edge Multi-Colored Thinning Scissor Adjustable Screw with Removable Finger Rest. Available Sizes. 4 in, 4.5 in Details. Razor Edge thinning scissors made of Japanese stainless steel J/2 – 420, HRC (hardness) 52 – 55. Also available in 440C HRC (hardness) 60 – 65. Available in fix, limitation, adjustable and hand adjustable screws with and without leaf spring