Hex heads are six sided for use with a wrench.
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. Phillips drive is x-shaped for installation with a phillips screw driver.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
Solid brass. An alloy of primarily copper and zinc with good corrosion resistance. Used mostly in decorative and electrical applications. Exact color varies.