Material: Cr5MOV1 Hardness: 58-63 Rockwell Wide: 1/4" Wide Blade Compatible with Milwaukee: 6850-2, 6852-20, 6850-4 Superior Steel SB180M. Replacement Blade for 18-gauge Shear Cutter. Each blade is replaceable separately, but it is recommended to change all three at the same time for maximum sharpness. Replaces OEM center blade 48-44-0150(C), a left blade 48-44-0160(L) and a right blade 48-44-0170(R).