Blade Knive
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Drywall Knife
aka "utility knife" also includes small folding-, retractable- and/or replaceable-blade knives suited for use in the general workplace or in the construction industry. The latter type is sometimes generically called a Stanley knife, after a prominent brand designed by the American tool manufacturing company Stanley Works (subsequently merged into Stanley Black & Decker).
A drywall taping knife is a separate tool used to spread joint compound onto drywall. They come in 4", 5", 6", 8", 10", 12", and 14"File:Bladeknife.jpeg