Triangle Fastener Corporation (TFC) of Pittsburgh, Pennsylvania, recently announced the availability of a full line of 304 stainless steel bi-metal self-drilling screws.
Bi-metal screws have heads and threads made of 304 stainless steel providing exceptional corrosion resistance and ductility. A hardened carbon steel drill point welded to a stainless steel body, which allows the screw to drill and tap steel up to ½” thick.(…)
via TFC Launches A Full Line Of 304 Stainless Steel Bi-Metal Drill Screws.