A pocket cutter knife with a retractable cutting blade that is operated via a blade control unit. The blade control unit includes a thumb slider switch, a blade carrier, and a tension component that are operably connected to extend and retract a cutting blade that is held by the blade carrier. The pocket cutter may also include a magnet retained within the body shell of the pocket cutter.

A self-defense pocket knife with handle of suitable proportion to be grasped in closed first and a conveyance system configured for the emergency manual conveyance of a blade from a position for storage to a position for use without requiring the user to appreciably alter or compromise grip upon the handle during the course of such conveyance.

A self-defense pocket knife with handle of suitable proportion to be grasped in closed first and a conveyance system configured for the emergency manual conveyance of a blade from a position for storage to a position for use without requiring the user to appreciably alter or compromise grip upon the handle during the course of such conveyance.