To take measurements inside an area like a cabinet drawer, use your measuring tape from inside edge to inside edge. Take the reading and then add on the length of the tape housing which is often stamped on the case. Another way is to use your tape along with a combination square. Position the square upside down in one corner and pull the case past the square's blade. Select a number on the blade, and add the length of the tape.
If you have a rollaway storage cabinet, you know it makes a great tool center. To make it work even harder, check out the wide variety of accessories now available to customize it to your needs. Mesh drawer liners will keep tools from sliding around and protect drawer surfaces. Foam drawer organizers will let you store your tools nestled in foam. Slotted foam divider systems will separate and hold your tools in place.