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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Truss heads are wide with a low profile rounded top. Phillips drive is x-shaped for installation with a phillips screw driver.
The most common stainless steel for general hardware use.
A highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments. More expensive than 18-8.