PERMANENT LOCKING POINT for use indoors or outdoors to keep vehicles and bicycles safe. Attach to solid concrete ground/walls, or to truck/trailer beds. 16mm hardened CARBON ALLOY STEEL SHACKLE. 5/8” cement anchor bolts installed directly into the cement. 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. Product dimensions: 7.5” (19cm) anchor diameter, 1.65” (4.2cm) anchor height.