The Crete-Flex fastening system is a family of screw anchors for light to medium duty applications in concrete and masonry block materials. Crete-Flex anchors utilize more robust 40є threads for enhanced thread engagement and “V” notches for efficient tapping. These features provide exceptionally high mechanical strengths. For every project, it is important to consider several things before making a selection: The proper head style, the color or finish that is desired, and the required level of corrosion resistance. The Crete-Flex screw anchor is available in 410 stainless steel. Head styles include a hex washer, hex flange, phillips flat and phillips trimfit.