Self drilling screws have a drill bit point. Flat heads are countersunk (cone shaped under the head) with a flat top. Phillips drive is x-shaped for installation with a phillips screw driver.
A stainless alloy that is harder than 18-8 stainless steel, but not as resistant to corrosion.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.
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Round heads are domed and look like half of a sphere. One way drive is installed with a flat bladed screw driver but cannot be removed without special tools.
The most common