Sizes, types, and uses of nails
1-10. Screws. Screws are another means of fastening one member to
another. Screws have some advantages over nails. They have greater
holding power, present a neater appearance, and have more decorative
possibilities than nails. They also have the advantage of being
easily removed or tightened.
a. Phillips Head. Screws are usually either slottedhead or
Phillips head (Figure 133). Phillips head screws require a special
screwdriver for driving them. Some advantages of Phillips head
screws are that the screwdriver does not slip out easily and that the
head is not as apt to break as that of a conventional type screw.
Slotted and Phillips head