Airtoon 9-Piece Magnetic Extension Bar Holder, Magnetic Extension Bar Organizer, Made of high quality, heavy duty, and impact resistant ABS plastic, it can be used for a long time. Nice way to get the extensions organized and easy to access, your extensions will not roll around in the drawer of box. (Extension Bar not included). This AIRTOON organizer holds the following: 1/4"drive extensions: 2-inch, 4-inch and 6-inch; 3/8"drive extensions: 3-inch, 6-inch and 10-inch; 1/2"drive extensions: 3-inch, 5-inch and 10-inch. The magnet is strong and stays in place even when you roll box out into the lot. It also allow you to attach the holder to any steel surface. It hold multiple sizes and is portable that saves trips to the toolbox. The size marking clearly printed along the tray for easy viewing and even easier identification of the extensions you need.