Bracket accommodates steel and aluminum cylinders including D, E and Jumbo D sizes. Will not interfere with most oxygen regulator controls. Heavy-duty nylon strap and metal buckle keep cylinder in place. Bracket can be mounted vertically or horizontally. Dimensions: D: 18-3/4"H x 5-3/4"W x 6-1/4"D; E: 23-1/2"H x 5-3/4"W x 6-1/4"D.