The QL-623 is part of Quik- Lok's "Pro Series" keyboard stand line. These stands are the absolute hands down choice of professional musicians the world over because of their adjustability, strength and reliability. Features include "The Original" locking disc system and super heavy duty 30 mm x 30 mm steel tube bracing for extra sturdiness and structural integrity. The "Pro Series" stands are capable of holding the heaviest keyboards safely and securely. The QL- 623's patented three-tier design