Middle-Atlantic's 3U Rackmount LockBox is a perfect addition to any rackmount. A spacious 3U (5.25"H) space, which fits the width of any standard 19.5" rack, sits behind a sturdy steel door. To secure devices and documents out of sight but within reach, install a Middle-Atlantic LockBox.
It's hard to find anything good or bad about these--they're black sheet-metal boxes with a lockable hinged door on them and cable access in the back. A great way to keep your workspace orderly Similar to drawers, but more useful on slanted racks like the ones at my recording/producers desk. I'm not that concerned with the security of them, and someone could probably pretty easily get into them with a pry-bar, but maybe I'll need to lock them in the future. I keep small camera equipment in one of them and use the cable access for the battery chargers. Note that when they say these are special order they mean it - it took several months for these to finally ship direct from Middle Atlantic. Fortunately I wasn't in a big hurry.
Perfect for storing tools you need. Lock keeps other hands from borrowing.