Supported cylinder sizes: D, E, M9, M60 (8" diameter, 36" height) Cart dimensions (WxDxH): 12.5"w x 14"d x 42"h. Oxygen Tank Cart Features: Transport one small cylinder. Two 8" semi-pneu wheels with plastic hub (1.75" wide) Designed with a simple scoop 8.25" x 8.25" baseplate. Handle height is approximately 42".