DEWALT DWST08110 TOUGHSYSTEM® SHALLOW TOOL TRAY

Only one per box or it rests on the contents

Not as useful as I originally had hoped (not as much utility as the price would have you expect.) They want you to be able to stack more than one in a tool box, if it's deep enough, but there is only one position (at the top) to latch one to, so if anything in it is even slightly above the top height, whatever you stack on top is now resting on that item above the top edge. There is also no central handle to quickly grab it and set it aside with one hand, you really need to use two. Also, if you have contents in the bottom of your toolbox, and then you want more than one tray, you're resting all but the top tray on whatever contents are on the bottom, probably unlevel.