BS100B EZ-Glide Music Stand. The EZ angle roller with special frictioning rubber holds the desk at the desired angle. Equipped with a clutchless grip for easy height adjustment. The inner locking mechanism secures the desk at the desired height. To adjust the clutchless grip, push the upper shaft until a yellow switch appears at the base of the shaft. Twist, one click at a time: clockwise to loosen and anti-clockwise to tighten. Desk size: 21"x11.5". Height 27.1"-48.4". Weight 3.2lbs.