DEWALT Blue-Tip concrete bolts are a one-piece heavy duty screw designed to ensure a simple installation with high load capacities. Featuring a patented thread for tapping into the hole during installation providing keyed engagement and allowing for reduced edge and spacing distances. Designed for use with standard metric drill bits, reducing installation torque and increasing productivity. Pack of 25. Euro Class A1 Fire Rating Hex Socket for a Secure Driving Force Hardened Steel Construction Zinc-Plated Deep Coarse Thread for Secure Fixing & High Pull-Out Resistance Fully & Partially Threaded Lengths ETA Option 1 Approved for Cracked & Uncracked Concrete Patented Thread for Easy Installation & Increased Productivity Euro Class A1 Fire Rating Hex Socket for a Secure Driving Force Hardened Steel Construction Zinc-Plated Deep Coarse Thread for Secure Fixing & High Pull-Out Resistance Fully & Partially Threaded Lengths ETA Option 1 Approved for Cracked & Uncracked Concrete Patented Thr...