THIS CHROME PLATED STEEL OXYGEN CYLINDER RACK FROM DRIVE MEDICAL IS A SECURE WAY TO TRANSPORT OR STORE MULTIPLE OXYGEN CYLINDERS. AVAILABLE IN THREE DIFFERENT CONFIGURATIONS SUPPORTING EITHER D/E OR M6 CYLINDERS THERE IS A RIGHT CHOICE FOR YOU. THE RACK EVEN COMES WITH MOUNTING BRACKETS ON THE UNDERSIDE SO THAT IT CAN BE INSTALLED IN A TRUCK. CHROME PLATED STEEL. MOUNTING BRACKETS ON BOTTOM FOR IN TRUCK INSTALLATION. HEAVY DUTY WELDED CONSTRUCTION. FOR USE WITH 12 D OR E CYLINDERS.