The Systainer³ insert box system is built on a 50mm x 50mm (2in x 2in) grid. This 2x7 insert box occupies 14 grid units — 2 units deep by 7 units wide — so it measures 100mm x 350mm (4in x 14in). It's sized to span the full width of an Organizer M's 7-unit-wide grid in one row, and works well for marking tools, cable ties, or long fasteners.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.