The AVJ42XL Steel Adjustable Height Extra Large AV Cart , in black, from H. Wilson is a rugged utility cart with steel reinforced shelves. The top shelf is height-adjustable from 24 to 42", which is the top point of the cart. All three shelves feature a 1/4" lip around the edges that help prevent slippage. The cart also has a UL-listed 3-outlet electrical assembly with a 15' cord, making it suitable for classrooms and similar environments. For moving it around, the cart has 4" ball-bearing casters with two locking brakes.