This product is made of zinc alloy material, it is durable and stable, Also safer. | Solid construction，works well，and feels more secure having a sturdy place to store a backup key. | Let you customize your own access code, store keys securely inside with up to 10,000 possible combinations, so your key can still stay secure | The Key Safe Lock Box hangs easily on any doorknob, fence, railing, and more--no tools needed. Simply open the lock box, release the shackle and hang. | This key safe box is ideal for emergency entry for seniors, families, friends, realtors, home healthcare access, vacation homes, construction, trades, and storing spare keys etc.