#8 x 3 SHEET METAL SCREWS / Phillips / Truss Head / Steel / Black Oxide 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

DeWALT SKU-DFM4EMH530-The Crete-Flex anchor is a 410 stainless steel screw anchor for light to medium duty applications in concrete and masonry block base materials

Fasteners accept standard nuts and washers (if desired and/or required)

8-15X2 Phillips Bugle Head Fine Thread Drywall Screw Black Phosphate

meaning it grabs the flats of the screw and not the corners

#8 x 3 SHEET METAL SCREWS / Phillips / Truss Head / Steel / Black Oxide Bi-Flex structural screws are bi-metal