Vented Socket Head Screws are drilled or hollowed out from top to bottom. Great for racing with reduced weight. They also allow gases or wiring to pass through. 18-8SS, which is a Type 300 series Stainless Steel, is one of the most widely used corrosion resistant metals for threaded and non-threaded fasteners. Uses include many marine, electrical and food industry applications. It has fair machinability and cold forming properties. Max. tensile strength: 150,000 PSI. These screws have reduced strength values, NFF assumes no liability in their use.