Why do box cutter knives have those diagonal lines on the blade

The MILWAUKEE Fixed Blade Utility Knife features a fixed blade mechanism holding the blade firmly in place. The Milwaukee utility knife has tool free

Fixed Blade Utility Knife with General Purpose Blade

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Stanley Fixed-Blade Utility Knife 10-299 - The Home Depot

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How To Snap-off Utility Cutter Blades

WORKPRO 2-in-1 Folding Knife/Utility Knife, Quick-Change Box Cutter with Belt Clip and Liner Lock, Extra 10 SK5 Blades Included