Rock Lock system lets you set up in seconds, simply push the lock to release the ladder, then tap to lock Aircraft-grade lightweight aluminum ladder provides versatility and stability while you work Dual pin hinge and wide flared legs puts you in the safest position to get the job done Easy to adjust to multiple heights and can adapt to almost any job Ladder configurations include: A frame, staircase, 90 degrees, extension, and scaffolding Tip and Glide wheels make transporting from job to job easy Complies with all applicable OSHA and ANSI A14.2 standards Specifications: Maximum extension height: 17 feet Minimum extension height: 9 feet Maximum scaffolding height: 3 feet Maximum workbench height: 4 feet Maximum A frame height: 7 feet, 1-inch Minimum A frame height: 4 feet, 1-inch Spreader system: Hinge lock Palm and hinge system: Triple locking hinge Weight capacity: 300 pounds Unique configurations: 24 Storage height: 4 feet 7 inch Storage depth: 9 inches Color: Silver Weight: 30.5 pounds