This a triple height socket tray for 4mm-15mm 1/4" sockets: Shallow, Semi-Deep, and Deep Well. (The size range includes 5.5mm)
I used chrome Kobalt, Snap-On, and Icon sockets as measurements for each hole diameter, so most brand's chrome sockets should fit. The exception would be impact sockets as they have thicker walls, this model likely will not fit impact sockets.
This tray is 237mm long and will require a medium size (250mm) or larger print bed to print in once piece. Smaller printers will require a cut via your slicer and multiple prints.
3/8" Socket model can be found here:
https://www.printables.com/model/1118965-triple-height-38-metric-socket-tray
The author marked this model as their own original creation.