Metric shoulder bolts (domestically produced), 4mm shoulder (3mm x 0.5mm thread) x 10mm

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.