In fact, the patent for the original Phillips head screw ran out long ago – so unless ... you may be using a Pozidriv. Since ...

Flat head screws could be made with a slitting ... They’re usually awful screws, but you don’t need a tool! Pozidriv screws look really similar to Phillips except for the small X stamped ...

A Phillips head is a straightforward four-point drive though it is designed so that the screwdriver or drive bit will come out of the screw before the screw itself fails. A Pozidriv, on the other ...

When you use a screwdriver, use one with the correct head (whether flat-blade, Phillips, Pozidriv, or other) and size for the screw you are driving. This applies whether you are power-driving ...