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If your application may require ongoing maintenance, you may be better off purchasing a reusable two way screw– which is secured with a tool or bit that solely matches the unique drive of a specific fixing – meaning they are tamper proof against thieves that are using standardised tools.

3 Ways to Remove One Way Screws - wikiHow

If you’re lucky and the one-way screw is very loose, you may be able to unscrew it slightly using a regular screwdriver. They are often secured using non-standard tooling due to their design being unique, but a number of the fasteners may require security bits to be fastened. For this method, you’ll need to use a drill bit ¼ of the size of the screw head so it can fit inside the screw shaft.Twist the small knob at the base of 1 of the pliers’ arms until the pliers are set to lock at the exact diameter of the screw head. Creating a Slot in the Screw An innovative method to remove one way screws is to make slots in which to place your standard screwdriver. Take a small pair of locking pliers and squeeze the pincers snugly around the head of the one-way screw. If you're having difficulty getting a grip with the pliers, you may want to file two opposite sides of the screw's head and then place the pliers in those flatten edges.