The MK-20 housing is refillable

First Notch Inside Perimeter of 8

The quality of this SIG Sauer product

uniformed appearance

ASP Vigilance Key Return System COLOR:Silver The MK-20 housing is refillableASP Vigilance Key Return System Professionals are often reluctant to place their name and address on a set of keys. They fear that lost keys will make their home vulnerable. Through the Key Return Program, ASP maintains a directory of the individuals who register their key tag with the corporation. In this way, lost keys can be dropped into any mailbox and sent to us postage paid. We will then return the keys to the owner.