FOUR FLAT Sides deter rolling FOUR FLAT Sides feature wrench-ready design 90 tooth design with 4 degrees of arc swing for tight work spaces Stamped socket sizes Slim profile ratchet with flush directional lever Removable inner tray specifically designed for steel storage Storage trays FIT ONLY Milwaukee FOUR FLAT Sides Sockets. Lifetime Guarantee Fully compatible with Milwaukee PACKOUT Modular Storage System PACKOUT Organizer has an Impact Resisitant Body PACKOUT Organizer has a IP65 Rated Protection PACKOUT organizer has reinforced hinge PACKOUT organizer has heavy-duty latches PACKOUT organizer has clear top for easy identification of contents