Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use.
Also known as A-4 stainless, 316 is a highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments.
A general purpose nylon often used in fasteners for corrosion resistance.
Screws with an Allen wrench drive.
Screws with machine threads for use with a nut or in a tapped hole.