1/4-20 x 4 Elco Bi-Flex / Hex Washer Head / 18-8 Stainless / Stalgard / QTY 500 Serrations on underside of hex

Serrations on underside of hex washer head lock against the fixture

10X3 1/2 Phillips Recess Bugle Head Coarse Thread Drywall Screw Zinc Yellow

1/4" x 2-1/4" DeWALT blue concrete screws

Aluminum-to-steel connections

1/4-20 x 4 Elco Bi-Flex / Hex Washer Head / 18-8 Stainless / Stalgard / QTY 500 Serrations on underside of hexBi 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. Bi Flex screws are suitable for use in both steel and aluminum. Features & Specs High strength, ductility and reliability Higher corrosion resistance compared with carbon steel and 410 series stainless steel fasteners 18 8 stainless compatible with pressure treated lumber Immune to