Masterlock 5422D portable push button lock box

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Over the door knob design for portable installation
Convenient push button locking mechanism in familiar alpha / numeric telephone keypad format
Set your own combination using up to 12 letters, numbers, or both
Large buttons for ease of use, even in low light conditions
Large internal cavity and removable key hook prevents jamming
Protective weather cover prevents freezing and jamming
Molded body and vinyl coated shackle prevent scratching
Internal Dimensions: 3-1/2in (89mm) H x 2-1/4in (57mm) W x 1in (25mm) D