Keeps two chests together and offers space for storage. 

It spaces the chests the right amount apart to get the gridfinity pattern on top in sync. Which makes it possible to place gridfinity parts on top reaching over two chests.

I use it to store a utility knife and a grading tool.

Fits this model: Gridfinity Drawer Chest Remix 

 UPDATE: Added a version with gridfinity base
 UDPATE #2 : Added Left and Right version for use at the end of a chest.