Elco Bi-Flex 300 Series SS Fasteners: 12-24 x 2, Hex Head, #5 Point#12 14 x 2" bi metal screws with a 300 series stainless steel head and threads fused to hardened steel lead threads and self drilling point. Stalgard GB coating provides a galvanic barrier. #5 self drilling point can drill thicknesses up to . 500". 5 16" hex drive. Bi Flex fasteners provide unmatched corrosion resistance and high performance in a wide range of demanding applications, including aluminum, and are virtually immune to delayed