Custom Built. Commercial Quality. Complete Security.

Master Lock is recognized around the world as the authentic, enduring name in padlocks and security products. Since our founding in 1921, we have worked hard to earn and maintain the trust of our customers by delivering on our promise of strength and quality and by continually setting new standards for lock design, application and performance. As the largest global manufacturer and marketer of padlocks, we continue to build our founder’s passion for innovation, quality, and compelling value into our expanding lines of security solutions.

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5440D and 5441D Bluetooth® Lock Boxes

The Key is Your Smartphone

Master Lock® Bluetooth® Lock Boxes offer the freedom to protect and control access to homes, businesses or vacation properties right from your smartphone. The free and intuitive Master Lock Vault® eLocks App allows users to assign who can access their property, and for how long. It’s the smart and simple way to confidently secure property and manage access from anywhere at any time.