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 stainless steel for general hardware use.
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A slotted hex washer head can be installed with either a wrench or a flat bladed screw driver, and has a built-in washer.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.
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