Toyo Steel are a manufacturer based in Osaka.  They sell a range of products under their own "Toyo" brand as well as making products for other well know Japanese brands.

These M-8 parts trays were once the normal way of storing small parts in the factories around Osaka.  They are open, without a lid, but can be stacked on top of each other.

The handles on the side can be folded in when used for stacking or drop to the side when "open"

Made from heavy weight steel - they weigh 1.6Kg

Equally at home storing items like watches and other EDC as they are in the workshop.  We've even seen them being used as Lego build or storage trays.