A permanent locking point for both the indoors and outdoors, the Kryptonite Stronghold Anchor Locking Point is designed to keep both your vehicles and bikes safe and sound. Using a 16mm hardened carbon alloy steel shackle, the Stronghold easily attaches to solid concrete ground with anchor bolts and the included masonry bits. The steel shackle lays flat within its domed body when you're not using it, making it safe to walk and drive over.