5/16-24 x 3-1/4 Elco DrilIt / Hex Washer Head / Steel / Stalgard / QTY 500 DeWALT DFM12722 blue concrete screw

DeWALT DFM12722 blue concrete screw anchor

Serrations on underside of hex washer head lock against the fixture

8X1 1/4 Phillips Modified Truss Head Fine Thread Drywall Screw Fully Threaded Zinc

6-18X2 1/2 Phillips Bugle Head Fine Thread Drywall Screw Black Phosphate

5/16-24 x 3-1/4 Elco DrilIt / Hex Washer Head / Steel / Stalgard / QTY 500 DeWALT DFM12722 blue concrete screwDril Flex Structural Screws are dual heat treated self drilling tapping screws that provide the strength, ductility and resistance to embrittlement required for critical applications. Features & Specs High hardness point and lead threads for drilling and tapping Stalgard and Stalgard SUB Coatings provide improved corrosion resistance as well as enhanced galvanic compatibility in dissimilar metal applications, including those involving aluminum,