KRYPTONITE "Stronghold" Ground Anchor. When used properly the stronghold anchor system provides maximum security protection against lift-away, tow-away, ride-away and roll-off theft. Attaches to ground, wall, truck, ute, van or trailer bed, 5/8" hardened carbon alloy steel shackle equal in strength to Kryptonite"s New York series level of security, 5/8" cement anchor bolts install directly into cement (masonry bits included in package). Professional installation not required. Recommended for both residential and commercial installation. Steel shackle lays flat within weatherproof domed body when not in use, making anchor safe to drive or walk over.