This stand uses the same tried-and-true bullet-nose knob as the Classic Single-X. Yet, the all-welded Double-X workhorse adds stability and holds more weight. Adjustable rubber arm sleeves can be positioned to fit virtually any keyboard width. Applications: Medium-format KeyboardsTubing: 1"Weight Capacity: 250 lbs. Height Adjustment: 27"-39"Base Spread: 11"-31"Construction: All-welded