The present invention prevents a latch bolt guide piece forming a strike from protruding from a door frame when the strike is mounted on the door frame, thereby fundamentally preventing accidents, during which children that are not paying attention hit their heads against the latch bolt guide piece, incur scratches on their hands or the like, from occurring, enabling clothes to be prevented from becoming caught therein and damaged, and resolving the disadvantage of a conventional strike of having a dangerous-looking exterior due to the protruding thereof.
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