This sturdy plastic box has 12 small (2" x 2") compartments and 6 large (2" x 4") compartments with fixed dividers for security. This is the same box we use for our Dzus Fastener "Constructor" Kit (Part No. 3026), but the size is handy for hundreds of other uses: nuts, bolts, washers, plumbing adapters, hose ends -- any small parts you need organized! Measures 13" x 9" x 2.25" overall.