Extra secure locking point for use indoors and outGold Sold SecureAbove-ground Stronghold model attaches to ground, wall, truck or trailer bedDomed shape can be driven over without damage to cargives a convenient and consistent location for locking valuable equipment5/8 inch cement anchor bolts install directly into cement (includes masonry bits)Steel shackle lays flat within domed body when not in use, making anchor safe to drive or walk overWeatherproofCompatible with Kryptonite chains and cablesRecommended for both residential and commercial installation6 mm hardened carbon alloy steel shackle