Extreme Tools RX Pro 19" Side LockerExtreme Tools RX Professional Series 19" Side Locker 3 Drawers and 3 Shelves The Extreme Tools RX Professional Series 19" 3 Drawers 3 Shelves Side Locker is the perfect way to add additional space to your professional workstation setup. It attaches to the RX Series 55" and 72" roller cabinets, adding plenty of storage that includes both deep and standard drawers and shelving for your large, bulky items. This Side Locker has two adjustable shelves that