One Way Screws These One Way Screws are Round Head Sheet Metal One Way Screws that are Zinc Plated. They can be installed with a standard, flat blade screw driver but can only be removed with a special removal tool. Many national retail stores continue to specify "One Way's" because they are still the most "Tamper-Proof" security screws available. Even with removal tool, this screw cannot be removed easily.
One Way Screws are Stainless Steel Round Head Sheet Metal
One Way Screws are Oval Head Sheet Metal