This anchor is a high-strength, case hardened screw with twin-lead, v-notched threads for anchoring into concrete, masonry, and brick. Advanced R-Blocker coating offers exceptional test results in salt spray testing. Wej-Con concrete screws install quickly in a pre-drilled hole and can be removed and reinstalled as often as necessary. Great for use in varied applications, such as: Cladding, Brick Ties, Window Frames, Upright Metal Shelves, Strapping or 2X4 Studs, Conduit Clips.