1/4-20 X 4 Thread Cutting Screws / Torx / Flat Head / Steel / Black Phosphate / Type F Bi-Flex structural screws are bi-metal

Bi-Flex structural screws are bi-metal self-drilling tapping screws that provide the corrosion resistance of 300 series stainless steel and the efficiency of drill screws

Better yet

Aerosmith®’s Blue Banger Hanger® Steel Deck Insert cast-in-place anchors are installed prior to pouring concrete which reduces installation and material costs and increases strength values

DeWALT SKU-DFM4EMF650-The Crete-Flex anchor is a 410 stainless steel screw anchor for light to medium duty applications in concrete and masonry block base materials

1/4-20 X 4 Thread Cutting Screws / Torx / Flat Head / Steel / Black Phosphate / Type F Bi-Flex structural screws are bi-metal