Standard enclosures do not remain standard for long. In no time, engineers put holes, cutouts, and recesses into pristine boxes. This process is necessary to make the enclosures functional. There are switches to mount, readouts to view and connections to be made.
Every application is unique and every solution is different, and all applications seem to require customizing the enclosure. Rather than create a custom package, OEMs often choose to modify, or customize, a standard enclosure. Reasons may be to lower development cost, reduce product cost or achieve a faster time to market. Seeking to achieve a more custom solution, OEMs request enclosure manufacturers to cut holes, slots, recesses and all manner of shapes into their standard enclosures.