The blades are hardened to 67HRC hardness. Infinity Elite Series Comparison Table : ModelTypeHead Width Head Thickness Handle TypeHead StyleCut758PL5142High Precision Cutters0.39'0.25'Ergonomic SlimOvalFull Flush758PL5340High Precision Cutters0.39'0.25'Ergonomic SlimTaperedSemi Flush758PL5341High Precision Cutters0.39'0.25'Ergonomic SlimTaperedFlush758PL5342High Precision Cutters0.39'0.25'Ergonomic SlimTaperedFull Flush758PL5541High Precision Cutters0.39'0.25'Ergonomic SlimTapered RelievedFlush758PL5161High Precision Cutters0.63'0.
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