The Ergotron H31BK is a 72-inch wide large AnthroCart that comes with one shelf (29.75" deep), four legs, one basetube, and 2-3/8" casters. It provides plenty of room for your computer plus extra space to spread out. It holds up to 150 lbs. Convert the cart to a stand-up desk – or add storage shelves above – by installing Extension Tubes. Shelves are made of 1" thick industrial-grade particle board with high-pressure, scratch-resistant laminate. Vinyl contour edge banding matches the laminate. Legs are 16-ga steel, 1.5" diameter with baked-on powder coat finish. The H12BK AnthroCart is available in black worksurface with black metal color. A lifetime warranty against manufacturing defects is included.