The Master Lock 5424D Lock Box, Resettable Combination Dials, Light Up Dials features a 2-7/8 in. (72 mm.) wide metal body for durability. Portable lock box with light up dials offers the freedom of controlling access to your property in dark and low-light conditions. Lock box dials are high-contrast, illuminating dials with resettable combination functionality which provide a secure, easy-to-manage storage location for spare keys and access cards. Easily attach your lock box to a doorknob and be confident in the strength and reliability of the product you just installed. Master Lock's Lifetime Guarantee provides peace of mind from a brand you can trust.