Removable Shackle - Two way installation with a removable shackle. Material - Crafted from high strength zinc alloy body and hardened-steel shackles, the key lock box guarantees secure for your keys. Ultra Security - This key storage box with 4 dials offers up to 10000 combination possibilities so that it is hard to crack. Large Storage Capacity - The key lock box outside size around: 7.3*3.5*9.3cm. Widely Usage - This weather-proof lock box is good for using in many areas, so that you no need to put your keys under the carpet or flowerpot for hiding.