Professional Razor Edge Barber Scissor Adjustable Screw, Removable Finger Rest. Available Sizes. 4 in, 4.5 in Details. Razor edge hair dressing scissors made of Japanese stainless steel J/2 - 420, HRC° (hardness) 52° - 55°. Also Avaiable in 440c, HRC° (hardness) 60° - 65°. Available in Fix, Limitaion, Adjustable and hand adjustable screws with and without leaf spring.