Kryptonite 16mm Bicycle Stronghold Anchor Bike Lock 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)