Nice and useful tray, Toolmaker51. Besides it is easier to pick up the scales with the rounded bottom, the tray is also practical because you have these tools at hand and easily locatable on those rare occasions when the workbench becomes a mess.
Perhaps these trays could be used to store some tools in a drawer or, if you place walls at the ends, to transport them from one place to another within the workshop.
They could also be made of vinyl sheet, or PVC pipe 4 ", split in half.
Thanks for sharing.