The Yakima Locking Blockhead is bomber security. The Locking Blockhead holds one bike, and mounts on pickups, RVs, and boats (mounting hardware not included). It locks your bike to the mount with SKS cores and keys, which are included. The durable and corrosion resistant Locking Blockhead also comes complete with a beefy 9mm skewer. Padding protects your truck's finish. Non-locking Blockhead also available.