This is a small tray for holding the 10mm Allen key that is used to attach and remove the bike rack from my towbar.
The tray fits in the space between the driver side seat and the door trim of my 2011 Nissan Leaf.
I added a strip of velcro (the "loop" half) to the bottom so the tray sits there securely, but is also easy to remove for cleaning (which I should have don'e before taking the photo - sorry!)
The centre space can be used for coins or other small items.
Prior to making this I used to leave the Allen key in the centre console space, or the cup holder, or the door cavity. Then I'd waste time hunting for where I'd last left it. Now that frustration is gone.
The Allen key measures: 120mm on the long edge by 50 mm on the shorter edge.