Round heads are domed and look like half of a sphere. Slotted drive has a simple slot for a flat bladed screw driver.
A corrosion resistant steel alloy. The most common stainless steel for general hardware use.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
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Screws with machine threads for use with a nut or in a tapped hole.
Screws with an Allen wrench drive.
