The oldest and Probably the most common screw heads is slotted. This screw is applied with a flathead screwdriver. Even though it is commonly made use of, the screw head is often very easily damaged plus the blade in the screwdriver can easily slip out with the slotted head. Also https://types-of-roof-repair82480.bloguetechno.com/the-basic-principles-of-types-of-screw-heads-diagram-64719049