Master Lock 5420D: Secure Combination Key Lock Box with Adjustable Shackle

The Master Lock 5420D Combination Key Lock Box is the perfect solution for securing and sharing keys safely. Featuring a durable, weather-resistant metal construction, this lock box ensures your keys are protected in all conditions. The adjustable shackle offers flexibility, allowing you to attach the lock box to various locations such as doorknobs, fences, or gates. With its easy-to-use combination lock, you can set and reset the code as needed, ensuring only authorized individuals have access. Ideal for real estate agents, property managers, and homeowners, the Master Lock 5420D provides peace of mind and convenience for key storage and sharing.


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Controlling access to homes, rental properties, or construction sites has never been easier or more convenient. If you are a real estate agent, property manager, or Airbnb host, the Master Lock 5420D Set Your Own Combination Portable Lock Box with Adjustable Shackle is the only integrated lock box product on the market that features an adjustable shackle for secure use on most types of door hardware. While other lock box models can be easily removed from lever style handles, the Adjustable Shackle Lock Box cinches tightly and securely to most door hardware styles. The 5420D also fits securely to knob and handle hardware styles, providing versatility for those who need to share keys, key fobs and access cards.

From the manufacturer

Master Lock Universal Lock Box, Adjustable Shackle Key Safe, Set Your Own Combination Lock Box

Master Lock 5420D Set Your Own Combination Portable Lock Box with Adjustable Shackle, 9.9 cu in.

Universal Shackle Lock Box, Adjustable Shackle Lock Box, Master Lock, Portable Lock Box, Key Safe

adjustable shackle

Key storage for car keys, house keys, key fobs, access cards

Set Your Own Combination Lock Box, Portable Lock Box, Large Key Safe

Fits Securely on Most Door Hardware Styles

The Master Lock 5420D fits securely on most door hardware styles including: lever, ball, biscuit, and tulip door knob styles. Weather cover protects dials from freezing and jamming due to rain, snow, or dust.

Adjustable Shackle

The only lock box on the market to feature an adjustable shackle, lock box cinches tightly to fit more types of handles than a traditional lock box. Ideal for real estate professionals who need the convenience of knowing one lock box will meet their needs, no matter what type of door hardware is used at a property.

Store Up To Six Keys

Large internal capacity allows secure storage of up to six keys. Works well with house keys, car keys, key fobs, and access cards.


After product installation, open door from the inside to ensure that product does not interfere with door jamb. Lever-style door handles may require upward rotation to open door from the inside.

Master Lock, Lock Box, Universal Lock Box, Small Lock, Set Your Own Combination, Portable Security
: B07FD2N88X
: 500 Items
Hurry! only 500 items left in stock.

Data sheet


Specific References


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  • Paste the label on a flat surface on the package
  • Make sure that both 1D and 2D barcodes are clearly visible
  • Ensure that the label is smooth and isn’t creased or wrinkled
  • Check for any tears, dents, holes or scratches
  • Pack your product tightly, with the right size packaging
  • Ensure both barcodes are on a flat surface of the package

Example Shown : SIZE XL, Hem to Hem 84cm OR 33 ,SIZE L, Hem to Hem 84cm OR 33 ,SIZE M, Hem to Hem 84cm OR 33 ,SIZE S, Hem to Hem 84cm OR 33
Rated 4.75 on the scale 1 - 5 based on 4 customer reviews

Excellent Product and Customer Service

I bought the Master Lock 5420D for my elderly parents, and it has been fantastic. They can securely store their spare keys without worrying about losing them. The setup was straightforward, and when we had a question, OneFantasticShop's customer support was very helpful and responsive. Highly recommend this product!

Perfect for Real Estate Agents

As a real estate agent, the Master Lock 5420D has been a game-changer. The combination lock is easy to set and reset, providing secure access for clients and contractors. The durable build gives me peace of mind that my keys are always safe. It's a must-have for anyone in the property management business

Secure and Versatile Key Storage

The Master Lock 5420D is incredibly secure and versatile. I use it to store keys for my rental properties, and the adjustable shackle makes it easy to attach to various locations. The weather-resistant construction ensures that the keys are protected no matter the conditions. It’s a reliable solution for key storage.

Exactly what I was looking for

The lock was easy to install using the directions that came with it. It’s very sturdy and has a cover over the push buttons to make it weather proof.

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