Professional Razor Edge Barber Scissor Adjustable Screw, w/Removable Finger Rest. Available Sizes. 4 in, 4.5 in Details. Razor edge hairdressing 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.