Easily remove One-Way screws with this tool. One-Way screws are slotted screws, and can be installed with a standard slotted screwdriver. However, removing them without the proper tool is difficult. When you try to extract the screw, the slotted screwdriver tip will not grip and rides out of the slot. Half of each side of the slot is smoothed down during manufacturing. One-Way screws are available in a round head design in both machine and sheet metal type.