ITW Red Head Large Diameter Tapcon (LDT) Anchor is a high performance anchor that cuts its own threads into concrete. Anchor bodies are made of hardened carbon steel and zinc plated. The anchors have a finished hex washer head with anti-rotation serrations to prevent anchor back-out. The head of the anchor is stamped with a length identification code for easy inspection. The anchor should be installed with carbide tipped hammer drill bits made in accordance to ANSI B212.15-1994.