The Master Lock No. 5420D Portable Universal Lock Box features a 2-7/8 inch (72mm) wide metal body for durability. The new 5420D lock box features an adjustable shackle for secure use on almost any type of door hardware. While other lock box models can be easily removed from lever style handles, the 5420D cinches tightly and securely to most types of lever styles. The 5420D also fits securely to knob and handle hardware styles, providing a secure storage location for spare keys and access cards.