Permanent locking point for indoor or outdoor use to keep vehicles and bicycles safe. Attach to ground wall truck or trailer bed. 16mm hardened carbon alloy steel shackle. Includes 2 masonry bits (1 initial pilot hole, 1 final moly-bolt diameter). Steel shackle lays flat within domed body when not in use making it safe to walk or drive over. Recommended for both residential and commercial applications.