The Master Lock 5400D Lock Box Resettable Combination Dials features a 3-1/4 in. (83 mm.) wide metal body for durability. Portable lock box design offers removable over the knob installation. Set your own four-digit combination for keyless convenience and increased security. Lock box includes a shutter door which protects combination dials from weather dirt and grime; and molded body and vinyl coated shackle prevent scratching. Master Lock s Lifetime Guarantee provides peace of mind from a brand you can trust.