The Master Lock 5400T Set Your Own Combination Portable Lock Boxes (2 PK) features a 3-1/4 in. (83mm) wide metal body for durability. The portable design offers removable "over the knob" installation. Set your own four-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. Includes two set your own combination lock boxes. The Limited Lifetime Warranty provides peace of mind from a brand you know and can trust.