Description The Master Lock No. 5400D Portable Lock Box features a 3-1/4in (83mm) wide metal body for durability. The portable design offers removable âover the knobâ installation. Set your own 4-digit combination for keyless convenience and increased security. The shutter door protects combination dials from weather, dirt and grime; and molded body and vinyl coated shackle prevent scratching. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.Features:Over the door knob design for portable installationLarge internal cavity prevents jamming, even when holding multiple keysSet your own combination convenience for optimal securitySet your own 4-digit combination for keyless convenience and increased securityProtective weather cover prevents freezing and jammingMolded body and vinyl coated shackle prevent scratchingAlso available with personalized laser engraving - Learn moreInternal Dimensions: 3-1/2in (89mm) H x 2-3/4in (70mm) W x 1in (25mm) D