Standard: Front casters / rear end rubber ; Size: W 20.9 - 24.0 - 20.7 - 21.6 inches (530 - 612 x 525 - 549 x 740 mm); Weight: 5.5 lbs (2.8 kg); Material: Aluminum; Width can be adjusted with 4 different extended. Height is adjustable to 5 levels. Folding