The Extreme Tools® EX Professional Series 24in. 4 Drawer and 3 Shelf Side Cabinet is built to last a lifetime and is one of the sturdiest you will find. It comes fully assembled with a super heavy-duty support bracket that bolts under both the roller cabinet and side cabinet so that no extra support is needed. The four drawers and three shelves (1 fixed and 2 adjustable) use ball bearing slides load rated 300 lbs. per set, making it easy to store and access your tools and personal items. If you need a larger space, the slides allow you to remove and adjust the shelves so that you can store bigger items. The side cabinet door can be adjusted to swing from the left or right and can be mounted on either side of your tool box. The EX2404SC Extreme Professional Side Cabinet fits on the EX Professional Series roller cabinets: 72in. 17 Drawer Triple Bank Roller Cabinet, 55in. 11 Drawer Roller Cabinet, or 76in. 12 Drawer Roller Cabinet.