Material: Cr5MOV1 Hardness: 58-63 Rockwell Compatible with Milwaukee: 6850-2, 6852-20, 6850-4 Superior Steel SB180M-R. Replacement Blade for 18-gauge Shear Cutter. Blade is replaceable separately, but it is recommended to change right blade for maximum sharpness. Replaces OEM right blade 48-44-0170.