they supply extra security for the utilized power compared to the Phillips screws. The difference between a Phillips screw plus a posidriv can be recognized by wanting them from facet. you will discover ribs between every one of the 4 arms on the posidriv and are marked by ‘pz’. you may notify torx

they are often installed with a typical flat-blade screwdriver, but can not be effortlessly eliminated using common applications. One-way screws are commonly Utilized in professional restroom fixtures and on motor vehicle registration plates, to forestall vandals from tampering with them. Hex screw