Simpson Titen HD mini screw anchors are self undercutting, non-expansion screw anchors that are designed to be quickly and easily installed. All Titen HD screw anchors feature a patented thread design with serrated cutting teeth for easy installation. Type 304 Stainless Steel is ideal for general exterior applications, where extreme corrosion resistance is not required. For enhanced corrosion resistance, check out our 316 Stainless Steel Large Diameter Concrete Screws.