These are modular containers that fit in Tactix/Montgomery/Keji brand 12 compartment storage boxes.
The containers can be easily moved between boxes and rearranged to make any combination of storage sizes. They are designed to fit within the standard dividers that come in the Tactix 12 compartment boxes, so you can use any combination of containers and dividers, as required.
The Tactix boxes these tubs fit into are: W200mm x L310mm x H50mm.
The Tactix boxes have some extra divider slots that are used in the 18 compartment version. to fit around these slots, there are 2 versions of the smaller containers, one for the middle compartments, and one for the end compartments.
The "end" version of the tubs will fit in any compartment, so if you want the flexibility of being able to put any container in any compartment in the box, just use the "end" versions in all compartments.
Where to find the Tactix Boxes
The Tactix boxes are sold by Bunnings Warehouse in Australia and New Zealand.
And are available at Homebase in the UK
If you know where these can be purchased in other parts of the world let me know, and I'll add them to the list.
If the you can't get the 12 compartment boxes, these containers should also work for the 18 compartment version, you just won't be able to use all the supplied dividers.
18 Compartment Boxes