Top Bar height adjusts from 63" - 78" in height. Lower Bar Height adjusts from 45"-60" in height. Tier step difference measures 18". Base: 49 5/8"W x 23 1/4"D. Constructed of heavy duty 1 1/4" diameter plumbing pipe in anthracite grey finish. Includes four 2" casters, 2 locking, 2 non-locking. The Pipeline collection is a uniquely designed merchandising collection based on the traditional industrial grade clothing racks popularized in New York's garment center. This stylized and refined version incorporates interconnecting plumbing pipes and various plumbing connectors.