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Introducing the Master 21LJ Master Key - Model #20, designed for exceptional versatility and compatibility. This master key allows access to a range of locks within the Master Lock system, making it an essential tool for property managers, locksmiths, and security personnel. Crafted with precision, the 21LJ key ensures smooth operation and reliable performance. Its durable construction guarantees longevity, making it a trusted choice for both residential and commercial applications. Simplify your access needs with the Master 21LJ Master Key, providing convenience and security at your fingertips.