3/8-16 x 3 Elco Tap-Flex / Hex Washer Head / Steel / Stalgard (250ct) meaning it grabs the flats

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

DeWALT SKU-DFM4EUH345-The UltraCon SS4 anchor is a 410 stainless steel screw anchor for light to medium duty applications in concrete and masonry block base materials

The 1/4-20 size ONLY is available for quote with a brass insert upon request

3/16" x 4" DeWALT blue concrete screws

3/8-16 x 3 Elco Tap-Flex / Hex Washer Head / Steel / Stalgard (250ct) meaning it grabs the flatsTap Flex Thread Forming Structural Screws are thread forming, dual heat treated self tapping fasteners that provide the strength, ductlity, and resistance to embrittlement failures required in critical curtain wall and dissimilar metal applications. Tap Flex fasteners are designed to offer a replacement option for traditional nut and bolt assemblies. These fasteners provide an excellent solution for blind connections. The patented E Form segmented