A hexagonal head for use with a wrench, with a metal-backed neoprene sealing washer and a drill bit point.
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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Oval heads are countersunk (cone shaped under the head) with a 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.