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Controlling the knife blade length appropriately may lead to usethe utility knife adversely or cut paper not straightly, and even knife blade splitting danger.
While using a utility knife, often didn't adjust into the appropriate knife blade
length so that cause knife blade splitting, even eruptive danger. Therefore,
we engrave the knife blade with match marks of knife blade length and paper
thickness. In addition, we take a knife line as the unit with 1 mm, it lets users
can compute conveniently, and slice the knife hull 30 degrees of parallel knife
line to mark to let users align knife blade and use utility knife more easily.