The Systainer³ insert box system is built on a 50mm x 50mm (2in x 2in) grid. This 2x3 insert box occupies 6 grid units — 2 units deep by 3 units wide — so it measures 100mm x 150mm (4in x 6in). Enough room for a compact multi-tool, a set of driver bits, or larger hardware assortments, and combines easily with other insert box sizes to build the exact layout you need.Every Systainer³ that uses insert boxes — the Systainer³ Organizer, Sortainer and Combi — can be thought of as its own grid of these 50mm units, which keeps the math easy when planning your compartment layout. Insert boxes fix securely into that grid to divide the space and keep your hardware and small components organized and separated for storage and transport.See the Technical Specs below for the grid size of each.