Harper Trucks MG-DE21 hand truck is designed for the safety, balance and ease of moving small oxygen cylinders in the home or office. It handles D and E type oxygen cylinders. Wheel diameter and type - 6-Inch by 1 1/2-Inch semi-pneumatic. Bracket chain height - 12-Inch. Dimension - 4 1/2-Inch ring. 39-Inch high by 11-Inch wide, 8 lbs. One year warranty, made in America. Since 1953, our mission has been to sell the highest quality products in the market. We have grown from a small, regional metal fabricator to the largest hand truck manufacturer in the world. Through our unmatched service commitments, worldwide distributor network, product guarantees, manufacturing process, and constant innovation we will continue to grow well into the next century.