utility knife, box cutter, Stanley knife = nożyk do papieru, nóż introligatorski

Utility Knife

Source: http://learnandgopollyco.blogspot.com/2010_06_01_archive.html

nożyk do papieru, nóż introligatorski

English sentence and Polish translation

You shouldn't play with a utility knife. = Nie powinieneś się bawić nożykiem do papieru.