The blades are hardened to 67HRC hardness. Infinity Elite Series Comparison Table ModelTypeHead Width Head Thickness Handle Type Head Style Cut 758PL5352High Precision Cutters0.49'0.25'Ergonomic SlimTaperedFull Flush758PL5291High Precision Cutters0.39'0.25'Ergonomic SlimOvalFlush758PL5150High Precision Cutters0.49'0.
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