Elco - Con-Flex - 3/8" Diameter HFH, Hex Washer Head with Locking Serration (50 Per Box) (Click for Sizes/Weight) Size:4 The anchors should be installed

The anchors should be installed with carbide tipped hammer drill bits made in accordance to ANSI B212

Installs perfectly even when concrete is wet

Even after 2

Flexible material is less susceptible to damage from crushing

Product Description:

Elco - Con-Flex - 3/8" Diameter HFH, Hex Washer Head with Locking Serration (50 Per Box) (Click for Sizes/Weight) Size:4 The anchors should be installedElco ConFlex Masonry Screws Enhanced ductility allows use in demanding exterior applications Con Flex masonry screws are engineered to provide high pull out and shear values with virtual immunity to brittle failures. _ ConFlex 3 8" and 1 2" diameter threaded fasteners engineered by Elco Construction Products provide high performance in masonry and concrete, even in exterior applications. Hex washer head with locking serrations prevents back out.