The Ansen Tools AN 113 Diamond Tip Phillips/Flat Head Concrete Screw Anchor with its Diamond Tip is designed for the most precise penetration in extra hard materials. The screws are made from high-grade hardened carbon steel with the advanced plating process; Envirocoat, which provides lifetime corrosion resistance. Drill bit included for pilot hole in concrete. Screw anchors are ICC Listed for Quality Control (see report ER-5045). Box comes with 100 screw anchors and carbide tipped drill bit.