Always wondered this whenever i open my screw driver box.
In: 19
There are really only a few types of screw head in common usage: flat (slotted), Phillips (star), and in Canada, Robertson (square). There are other shapes, obviously, like Torx and hex heads, but they tend to be more for bolts than screws. There are also some types of screw where the head is specifically designed so that you can’t turn it unless you have a matching esoteric bit, but most people will never see those.
All of them are designed to try to address the issue of being able to apply torque to the screw sufficient to drive it into the material without the head of the screwdriver slipping out (slotted screws) or rounding off and deforming (Phillips screws). Keep in mind that’s rounding off either the screw or the bit. Rounding off a bit sucks because it can happen quickly if you’re a dummy and it’s money in the toilet.
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