The square drive of this screw securely fits a driver ... Masonry screws come in two common head types: a flat head for countersinking, or a hex washer head to sit on top of the surface of ...

Flathead screwdrivers can easily slip from the screw head, posing a safety ... six-sided drive tip of a Torx driver, the six sides of the hex screwdriver are flat like a hexagon.