#12 x 2 Elco Bi-Flex / Hex Washer Head / 18-8 Stainless / Stalgard / QTY 1500 DeWALT SKU-DFM3EML300-The Aggre-Gator anchor is

DeWALT SKU-DFM3EML300-The Aggre-Gator anchor is a Bi-Metal 300 series stainless screw anchor for light to medium duty applications in concrete and masonry block base materials

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

DeWALT SKU-DFM4EMF430-The Crete-Flex anchor is a 410 stainless steel screw anchor for light to medium duty applications in concrete and masonry block base materials

DeWALT SKU-DFM4EMF470-The Crete-Flex anchor is a 410 stainless steel screw anchor for light to medium duty applications in concrete and masonry block base materials

The slotted aluminum sleeve helps to hold fast without loosening or backing out even with internal and external vibrations

#12 x 2 Elco Bi-Flex / Hex Washer Head / 18-8 Stainless / Stalgard / QTY 1500 DeWALT SKU-DFM3EML300-The Aggre-Gator anchor isBi 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